#include<iostream> using namespace std; int main(){ int n; cin>>n; if(n==1||n==3||n==5||n==7||n==8||n==10||n==12) cout<<"31"<<endl; if(n==4||n==6||n==9||n==11) cout<<"30"<<endl; if(n==2) cout<<"28"<<endl; return 0; }