#include <stdio.h>
double x;
double work(long long n){
	if(n == 1) return x / (1 + x);
	else return x / (n + work((n - 1)));
}
int main(){
	long long n;
	scanf("%lf%d", &x, &n);
	printf("%.2lf", work(n));
	return 0;
}