#include<iostream>
using namespace std;
int a[50000],b[50000],k=0,z=0;
void pra(int f){
     int i;

     for(i=2;i<=f;i++){
                   while(f%i==0){ f/=i; a[k]=i; k++; }
                   }
                   }
void prb(int a){
     int i;
     for(i=2;i<=a;i++){
                   while(a%i==0){ a/=i; b[z]=i; z++; }
                   }
                   }
int main(){
    int n,m,i,j,br=0;
    cin>>n>>m;
    for(i=n-m+1;i<=n;i++)
    pra(i);
    for(i=2;i<=m;i++)
    prb(i);
    sort(a,a+k);
    sort(b,b+z);
    for(i=0;i<50000;i++){
                     for(j=0;j<50000;j++){
                                      if(a[i]==b[j]){ a[i]=0; b[j]=0; break; }
                                      }
                     }
                     for(i=0;i<50000;i++){ if(a[i]) br++; }
                     cout<<br<<endl;
                     system("pause");
                     return 0;
                     }


This is my sourse and it works for some of the tests, but not for the all! So i have a problem on test 2. Can you tell me what to edit? 10x