#include<bits/stdc++.h>
#define in cin
#define out cout
#define abs(x) ((x>0)?(x):(-(x)))
#define max(a,b) ((a)>(b)?(a):(b))
#define min(a,b) ((a)<(b)?(a):(b))
#define FOR(i, a, b) for(int i = a; i <= b; ++i)
#define DOWNFOR(i, a, b) for(int i = a; i >= b; --i)
#define FOREACH(i, t) for (typeof(t.begin()) i = t.begin(); i != t.end(); ++i)
using namespace std;
int main(){
    #ifndef ONLINE_JUDGE
    ifstream in("test.in");
    ofstream out("test.out");
    #endif
    int N;
    in>>N;
    int b=N%2; N/=2;
    int a=N%2;
    if(a==0 && b==1) out<<16<<'\n';
    else if(a==1 && b==0) out<<16<<'\n';
    else if(a==1 && b==1) out<<15<<'\n';
    else if(a==0 && b==0) out<<15<<'\n';
    return 0;
}