#include<bits/stdc++.h> using namespace std; int main(){ /**int n; cin>>n; if(n % 3==0&&n % 5==0){ cout<<"YES"; }else{ cout<<"NO"; } char a; cin>>a; cout<<" "<<a<<endl; cout<<" "<<a<<a<<a<<endl; cout<<a<<a<<a<<a<<a<<endl; int a; cin>>a; if(a>=90){ cout<<'A'; }else if(a>=80){ cout<<'B'; }else if(a>=70){ cout<<'C'; }else if(a>=60){ cout<<'D'; }else{ cout<<'E'; } int op; cin>>op; switch(op){ case 1: case 3: case 5: cout<<"NO"; break; default: cout<<"YES"; }**/ int op; cin>>op; switch(op){ 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; default: cout<<"Invalid."; } return 0; }