#include<stdio.h>
FILE *in=fopen("fact.in","r"),*out=fopen("fact.out","w");
int n,p,i,nr;
int main()
{
fscanf(in,"%d",&p);
n=5;
nr=1;
while(nr<p)
  {
     n+=5;
     if(n%10==0)
        while(n%10==0)
          {
          n/=10;
          nr++;
          }
     else if(n%25==0)nr+=2;
          else nr++;
  }
fprintf(out,"%d",n);
fclose(in);
fclose(out);
return 0;
}