#include<bits/stdc++.h> using namespace std; int main(){ int a; cin>>a; switch(a){ case 1: case 3: case 5: case 7: case 8: case 10: case 12:cout<<"31";break; case 4: case 6: case 9: case 11:cout<<"30";break; case 2:cout<<"29";break; } return 0; }