#include<iostream> using namespace std; int main() { int a; cin>>a; 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<<"30"; }else if(a=9){ cout<<"30"; }else if(a=10){ cout<<"31"; }else if(a=11){ cout<<"30"; }else if(a=12){ cout<<"31"; } return 0; }