6 6
 1 4
 4 4
 3 3
 6 4
 6 3
 5 4
 5 6
 3 4
 1 3
 3 2
 5 5
 1 1
 2 1
 3 1
 3 5
 1 6
 6 5
 2 3
 4 3
 2 2
 3 6
 1 2
 6 1
 2 5
 4 5
 1 5
 6 2
 4 6
 5 1
 4 1
 5 2
 2 4
 2 6
 5 3

1/6
 1/2
 1/2
 2/3
 1/6
 1/6
 1/3
 1/6
 1/2
 2/3
 2/3
 1/3
 1/1
 5/6
 2/3
 1/3
 1/6
 1/6
 2/3
 1/2
 5/6
 1/6
 5/6
 1/6
 1/3
 1/3
 1/3
 1/6
 1/6
 1/3
 1/2
 1/3
 1/2
 1/6
 1/3

"""
Program for solution problem 9A

"""


def calculate_probability():
    input_numbers = [x for x in input()]
    big_number = input_numbers[0] if input_numbers[0] >= input_numbers[2] else input_numbers[2]
    probability = {
        '1': '1/1',
        '2': '5/6',
        '3': '2/3',
        '4': '1/2',
        '5': '1/3',
        '6': '1/6'
    }
    return probability[big_number]


if __name__ == '__main__':
    print(calculate_probability())
