diff --git a/B/04/05/01_First.c b/B/04/05/01_First.c
new file mode 100644
index 000000000..b0acb4c3e
--- /dev/null
+++ b/B/04/05/01_First.c
@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+    int n;
+    scanf("%d", &n);
+    int arr[n],i;
+    i=0;
+    do{
+        scanf("%d",&arr[i]);
+        i++;
+    }while(i<n);
+
+    do{
+    printf("%d\n", arr[n-1]);
+    n--;
+    }while(n>0);
+
+}
diff --git a/B/04/05/02_Second.c b/B/04/05/02_Second.c
new file mode 100644
index 000000000..8d8119e6e
--- /dev/null
+++ b/B/04/05/02_Second.c
@@ -0,0 +1,48 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+    int n,i,m,sum,k;
+    i=0;
+    sum=0;
+    scanf("%d",&n);
+    k=n-1;
+    int arr[n];
+    do{
+        scanf("%d",&m );
+        if(m%2!=0){
+            arr[i]=m;
+            i++;
+        }
+
+    }while(i<n);
+    i=0;
+    if(n%2==0){
+    for(;n>i;){
+        sum=arr[i]-arr[n-1];
+        n--;
+        i++;
+        printf("%d\n", sum);
+    }
+    }
+    else {
+        for(i=0;k>=i;)
+        {
+          if(k==i){
+            printf("%d", arr[i]);
+            break;
+          }
+
+        sum=arr[i]-arr[k];
+        k--;
+        i++;
+        printf("%d\n", sum);
+        }
+        }
+}
+
+
+
+
+
diff --git a/B/04/05/03_Third.c b/B/04/05/03_Third.c
new file mode 100644
index 000000000..11033c921
--- /dev/null
+++ b/B/04/05/03_Third.c
@@ -0,0 +1,172 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+    char ch[1000];
+   fgets(ch,1000,stdin);
+    int i=0;
+    int a,b,c,d,e,f,g,h,iq,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z;
+   a=b=c=d=e=f=g=h=iq=j=k=l=m=n=o=p=q=r=s=t=u=v=w=x=y=z=0;
+    do{
+        if(ch[i]=='a' || ch[i]=='A'){
+            a++;
+        }
+        if(ch[i]=='b' || ch[i]=='B'){
+            b++;
+        }
+        if(ch[i]=='c' || ch[i]=='C'){
+            c++;
+        }
+        if(ch[i]=='d' || ch[i]=='D'){
+            d++;
+        }
+        if(ch[i]=='e' || ch[i]=='E'){
+            e++;
+        }
+        if(ch[i]=='f' || ch[i]=='F'){
+            f++;
+        }
+        if(ch[i]=='g' || ch[i]=='G'){
+            g++;
+        }
+        if(ch[i]=='h' || ch[i]=='H'){
+            h++;
+        }
+        if(ch[i]=='i' || ch[i]=='I'){
+            iq++;
+        }
+        if(ch[i]=='j' || ch[i]=='J'){
+            j++;
+        }
+        if(ch[i]=='k' || ch[i]=='K'){
+            k++;
+        }
+        if(ch[i]=='l' || ch[i]=='L'){
+            l++;
+        }
+        if(ch[i]=='m' || ch[i]=='M'){
+            m++;
+        }
+        if(ch[i]=='n' || ch[i]=='N'){
+            n++;
+        }
+        if(ch[i]=='o' || ch[i]=='O'){
+            o++;
+        }
+        if(ch[i]=='p' || ch[i]=='P'){
+            p++;
+        }
+        if(ch[i]=='q' || ch[i]=='Q'){
+            q++;
+        }
+        if(ch[i]=='r' || ch[i]=='R'){
+            r++;
+        }
+        if(ch[i]=='s' || ch[i]=='S'){
+            s++;
+        }
+        if(ch[i]=='t' || ch[i]=='T'){
+            t++;
+        }
+        if(ch[i]=='u' || ch[i]=='U'){
+            u++;
+        }
+        if(ch[i]=='v' || ch[i]=='V'){
+            v++;
+        }
+        if(ch[i]=='w' || ch[i]=='W'){
+            w++;
+        }
+        if(ch[i]=='x' || ch[i]=='X'){
+            x++;
+        }
+        if(ch[i]=='y' || ch[i]=='Y'){
+            y++;
+        }
+        if(ch[i]=='z' || ch[i]=='Z'){
+            z++;
+        }
+        i++;
+    }while(ch[i] != '\0');
+
+    if(a>0){
+        printf("a - %d",a);
+    };
+    if(b>0){
+        printf("\nb - %d",b);
+    };
+        if(c>0){
+        printf("\nc - %d",c);
+    };
+    if(d>0){
+        printf("\nd - %d",d);
+    };
+        if(e>0){
+        printf("\ne - %d",e);
+    };
+        if(f>0){
+        printf("\nf - %d",f);
+    };
+        if(g>0){
+        printf("\ng - %d",g);
+    };
+        if(h>0){
+        printf("\nh - %d",h);
+    };
+        if(iq>0){
+        printf("\ni - %d",iq);
+    };
+        if(j>0){
+        printf("\nj - %d",j);
+    };
+        if(k>0){
+        printf("\nk - %d",k);
+    };
+        if(l>0){
+        printf("\nl - %d",l);
+    };
+        if(m>0){
+        printf("\nm - %d",m);
+    };
+        if(n>0){
+        printf("\nn - %d",n);
+    };
+        if(o>0){
+        printf("\no - %d",o);
+    };
+        if(p>0){
+        printf("\np - %d",p);
+    };
+    
+        if(q>0){
+        printf("\nq - %d",q);
+    };
+        if(r>0){
+        printf("\nr - %d",r);
+    };
+        if(s>0){
+        printf("\ns - %d",s);
+    };
+        if(t>0){
+        printf("\nt - %d",t);
+    };
+        if(u>0){
+        printf("\nu - %d",u);
+    };
+        if(v>0){
+        printf("\nv - %d",v);
+    };
+        if(w>0){
+        printf("\nw - %d",w);
+    };
+        if(x>0){
+        printf("\nx - %d",x);
+    };
+        if(y>0){
+        printf("\ny - %d",y);
+    };
+        if(z>0){
+        printf("\nz - %d",z);
+    };
+}
diff --git a/B/04/05/04_Forth.c b/B/04/05/04_Forth.c
new file mode 100644
index 000000000..ce60c075b
--- /dev/null
+++ b/B/04/05/04_Forth.c
@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+int main()
+{   int i,br,chek,k;
+    float n, sum;
+    i=0;
+    br=0;
+    chek=0;
+    k=0;
+    float arr[64]={ 0 };
+    while(scanf("%f", &n)!= EOF){
+            do{
+               if(n==arr[i]){
+                chek=1;
+               }
+            i++;
+        }while(i<64);
+        if(chek==0){
+                arr[k]=n;
+                br++;
+                sum=sum+fmod(n,5);
+        }
+        k++;
+        i=0;
+        chek=0;
+    }
+
+    printf("%d\n", br);
+    printf("%.3f", sum);
+   return 0;
+}