SOLUTION OF URI 1963

//    Solution of  1963 The Motion Picture
//   (Mahmud_Jamil) BRUR





#include <stdio.h>
int main()
{
    double A,B,C;
    scanf("%lf %lf", &A, &B);
    C = (((B-A)*100.00)/A);
    printf("%.2lf%%\n", C);
    return 0;
}