acgo

#include <iostream>
using namespace std;
int main(){
int n,p,sm=0;
cin >> n >> p;
if (n*p>1e9){
cout<<0<<endl;
return 0;
}
for (int i=0;i<n;++i){
sm+=p;
if (sm>1e9){
cout<<0<<endl;
return 0;
}
for (int j=2;j<p;++j){
if (sm%j==0){
--i;
break;
}
}
}
cout<<sm<<endl;
return 0;
}
答案