//weiwancheng
#include <iostream>
using namespace std;
int main()
{
    int n,f[10001]={0};
    cin>>n;
    f[1]=2;
    f[2]=3;
    f[3]=5;
    f[5]=7;
    int tou=4,wei=5;
    do{
        tou++;
    }while(tou<wei)
}