#include <stdio.h>
int main(){
	unsigned long p,k,i,aux;
	FILE*f=fopen("fact.in","r");
	FILE*g=fopen("fact.out","w");
	fscanf(f,"%ld",&p);
	if(p>0){
		i=5;k=0;
		while(k<p){
                	aux=i;
		      while(aux%5==0){
			aux/=5;k++;
		      }
		      i+=5;
		}
		if(k==p)
			fprintf(g,"%ld",i-5);
		else
			fprintf(g,"-1");
	}else
		fprintf(g,"1");
	return 0;
}