#include<stdio.h>
#include<algorithm>
using namespace std;
FILE *fin,*fout;
int N=1,p,j;
int main ()
{
    fin=fopen("fact.in","r");
    fout=fopen("fact.out","w");
    fscanf(fin,%d,&p);
    do
    {
        j=N;
        do
        {
            p--;
            j=j/5;
        }while(j%5==0);
        N++;
    }while(p!=0);
    fprintf(fout,%d,%N);
}