#include<bits/stdc++.h> using namespace std; int main(){ int n; cin >> n; if (a==1){ cout << "31"; }else if (a==2){ cout << "29"; }else if (a==3){ cout << "31"; }else if (a==4){ cout << "30"; }else if (a==5){ cout << "31"; }else if (a==6){ cout << "30"; }else if (a==7){ cout << "31"; }else if (a==8){ cout << "31"; }else if (a==9){ cout << "30"; }else if (a==10){ cout << "31"; }else if (a==11){ cout << "30"; }else{ cout << "31"; } return 0; }