#include<stdio.h>
#define infile "fact.in"
#define outfile "fact.out"

long n;

void read()
{
	scanf("%ld",&n);
}
void solve()
{
	long long i;
	long nr=0,x,ok;
	for(i=5;i<=1000000000;i+=5)
	{
		x=i;
		while(x%5==0)
		{
			nr++;
			x=x/5;
		}
		if(nr==n)
		{
			printf("%Ld",i);
			ok=1;
			break;
		}
	}
	if(ok==0)
		printf("-1");
}
int main()
{
	freopen(infile,"r",stdin);
	freopen(outfile,"w",stdout);
	read();
	solve();
	fclose(stdin);
	fclose(stdout);
	return 0;
}