import sys

for line in sys.stdin:
    a = line.split()
    if len(a) >= 2 and int(a[0]) != 0:  # 检查数组长度和除数不为零
        result = int(a[1]) / int(a[0]) * 100
        print(f"{result:.3f}%")
    else:
        print("0.000%")  # 处理数组越界或除零错误