# include<iostream> using namespace std; int main(){ int i,a,j,b=1; 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<<28;break; }return 0; }