# include<iostream> using namespace std; int main(){ int a; cin>>a; switch(a){ case 1: printf("31"); break; case 2: printf("29"); break; case 3: printf("31"); break; case 4: printf("30"); break; case 5: printf("31"); break; case 6: printf("30"); break; case 7: printf("31"); break; case 8: printf("31"); break; case 9: printf("30"); break; case 10: printf("31"); break; case 11: printf("30"); break; case 12: printf("31"); break; default: printf("Invalid."); break; return 0; } }