#include <iostream>
#include <cmath>

using namespace std;

bool czy_pierwsza(unsigned x)
{
    if(x == 1)
        return false;
    if(x == 2)
        return true;
    for(unsigned i = 2; i <= pow(x,0.5); ++i)
    {
        if(x % i == 0)
            return false;
    }
    return true;
}

int main()
{
    cout << czy_pierwsza(170) << endl;
    return 0;
}