#include <stdio.h>

typedef unsigned long long TYPE;

TYPE find_n(TYPE p) {
	// P	N
	// 0	1
	// 2	10
	// 10	45
	if (p == 0) {
		return 1;
	}
	TYPE p5 = 5 * p;
	return p5;
}

int main() {
	freopen("fact.in", "r", stdin);
	freopen("fact.out", "w", stdout);
	TYPE P;
	scanf("%llu", &P);
	TYPE n = find_n(P);
	printf("%llu\n", n);
	return 0;
}