#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <utility>
#include <string>

using namespace std;

int main() {
	int dice1[6] = {2,3,5,7,11,13};
	int dice2[6] = {4,6,8,9,10,12};
	int p, c;

	cin >> p >> c;
	double avg1 = 0, avg2 = 0;
	for (int i = 0; i < 6; i++) {
		avg1 += dice1[i];
		avg2 += dice2[i];
	}

	avg1 /= 6;
	avg2 /= 6;

	double expected = 1;
	for (int i = 0; i < p; i++) {
		expected *= avg1;
	}
	for (int i = 0; i < c; i++) {
		expected *= avg2;
	}

	printf("%.10lf\n", expected);
	return 0;
}