#include<stdio.h>
long int a;
unsigned long b;
FILE *in=fopen("fact.in","r"),*out=fopen("fact.out","w");
int main()
{
	fscanf(in,"%ld",&a);
	if((a-5)%6==0&&(a-5)>0) fprintf(out,"-1");
	else
	{
		b=a*5;
		b-=(b/25)*5;
		fprintf(out,"%ld",b);
	}
	fcloseall();
	return 0;
}