#include <bits/stdc++.h>
using namespace std;
int main()
{
int x;
cin >> x;
if (x == 1)
{
cout << 31;
}
else if (x == 2)
{
cout << 28;
}
else if (x == 3)
{
cout << 31;
}
else if (x == 4)
{
cout << 30;
}
else if (x == 5)
{
cout << 31;
}
else if (x == 6)
{
cout << 30;
}
else if (x == 7)
{
cout << 31;
}
else if (x == 8)
{
cout << 31;
}
else if (x == 9)
{
cout << 30;
}
else if (x == 10)
{
cout << 31;
}
else if (x == 11)
{
cout << 30;
}
else if (x == 12)
{
cout << 31;
}
}
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