#include <iostream>
using namespace std;
int main ()
{
int max1 = 40;
int min1 = 20;
int n;
int x = 0;
int y = 1;
cin >> n;
if ( n < min1 || n > max1)
{
cout << y << endl;
}
else
{
cout << x << endl;
}
}
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