#include <iostream>
using namespace std;

int main (){
    int m;
    cin >> m;

    if(m == 1) {
        cout << 31 << endl;
    }
    else if(m == 2) {
        cout << 28 << endl;
    }
    else if(m == 3) {
        cout << 31 << endl;
    }else if(m == 4) {
        cout << 30 << endl;
    }else if(m == 5) {
        cout << 31 << endl;
    }else if(m == 6) {
        cout << 30 << endl;
    }else if(m == 7) {
        cout << 31 << endl;
    }else if(m == 8) {
        cout << 31 << endl;
    }else if(m == 9) {
        cout << 30 << endl;
    }
    else if(m == 10) {
        cout << 31 << endl;
    }else if(m == 11) {
        cout << 30 << endl;
    }else if(m == 12) {
        cout << 31 << endl;
    }
  return 0;
}