problema 375

#include <iostream>
using namespace std;
int main()
{
    int n,d=2,ok=0,x=0;
    cin>>n;
    while (x!=1){
        n++;
        d=2;
        ok=0;
        while (d*d<=n && ok==0){
            if (n%d==0)
                ok=1;
        d++;
        }
        if (ok==0)
            x=1;
    }
    cout<<n;
}