#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int a; cin>>a; switch(a){ case (1): cout<<"31"; break; case (2): cout<<"29"; break; case (3): cout<<"31"; break; case (4): cout<<"30"; break; case (5): cout<<"31"; break; case (6): cout<<"30"; break; case (7): cout<<"31"; break; case (8): cout<<"31"; break; case (9): cout<<"30"; break; case (10): cout<<"31"; break; case (11): cout<<"30"; break; case (12): cout<<"31"; break; default: cout<<"Invalid."; break; } return 0; }