#include <iostream> #include <cstdio> using namespace std ; int a [21] ; int main ( ) { int n = 0 ; int t ; cin >> t ; t -= 16 ; if ( t == 0 ) { cout << 1 << endl ; return 0 ; } for ( int i = 0 ; i * 10 <= t ; i ++ ) { for ( int j = 0 ; j * 5 + i * 10 <= t ; j ++ ) { n ++ ; } } cout << n << endl ; return 0 ; }