#include <fstream.h>

unsigned long p, n;

int main()
{
	ifstream fin("fact.in");
	fin >> p;
	fin.close();
	ofstream fout("fact.out");
	n = p * 5;
	if( p == 0 ) fout << 1;
	else fout << n;
	fout.close();
	return 0;
}