#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){   
       if(p % 10 != 5){
		    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");
    }else   
        fprintf(g,"1");   
    return 0;   
}