#include <cstdio>
int p;
int main()
{
	freopen("fact.in","r",stdin);
	freopen("fact.out","w",stdout);
	scanf("%d",&p);
	if(p == 0)
		printf("1");
	else if(p == 5)
		printf("-1");
	else if(p < 5)
		printf("%d",p*5);
	else if(p > 5)
		printf("%d",p*5 - 5);
	return 0;	
}