#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,m[12]={31,29,31,30,31,30,31,31,30,31,30,31}; cin>>n; if(1<=n&&n<=12) cout<<m[n-1]; else cout<<"Invalid"; return 0; }