#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 n; cin>>n; switch(n){ 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; }