import java.util.*; public class Main { public static void main(String[] args) { Scanner sc=new Scanner(System.in); long k=sc.nextLong(); for (long i = k*4/5*5; i<=k*5; i+=5) { long cnt=0, n=i; while(n>0){ n/=5; cnt+=n; } if(cnt>=k){ if(cnt==k)System.out.println(i); else System.out.println(-1); return; } } } }
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