#include <stdio.h>
long int n, nr0,i2;
long int i; // Contor
bool ok=true;
FILE *in, *out;
int main(void)
{
    in=fopen("fact.in","rt");
    out=fopen("fact.out","wt");
    fscanf(in, "%ld",&n);
    if(!n)
        fprintf(out, "1");
    else
  {
    nr0+=25*(n/6);
    n%=6;
    nr0=nr0+n*5;
    if(n==5)
        fprintf(out, "-1");
    else fprintf(out, "%ld",nr0);
  }


    fclose(in);
    fclose(out);
    return 0;
}