#include <iostream>
#include <algorithm>

using namespace std;

int ans[2001][2001];
int n,m,i,a,b,k,j,x,y;
string s;



int main()
{
    cin>>n;
    if( (n/2)%2 == 0 && n % 2 == 1 )
        cout<<16;
    else if( (n/2)%2 == 1 && n % 2 == 0 )
        cout<<16;
    else
        cout<<15;

return 0;
}