#include <stdio.h>
#include <string.h>
#include <stdlib.h>

void main(void) {
	char str[1000000] = "a";
	scanf("%s",str);
	char *tokenA;
	tokenA = strtok(str, "/");
	char *tokenB;
	tokenB = strtok(NULL, "/");
	double a,b;
	a = atof(tokenA);
	b = atof(tokenB);
	printf("%f",a/b);
}