# include<iostream> # include<iomanip> 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; } else if(n==4 || n==6 || n==9 || n==11){ cout<<30; } else if(n==2){ cout<<29; } else{ cout<<"Invalid."; } return 0; }