// yukicoder: No.787 Mice and Traitors
// bal4u 2019.8.19

#include <stdio.h>

int main()
{
	double P, Q, pq;
	
	scanf("%lf%lf", &P, &Q);
	pq = P*Q;
	printf("%.9lf\n", 100*pq / (pq + (100-P)*(100-Q)));
	return 0;
}