#!/bin/python3
import sys
from math import sqrt

max_time = int(input().split(":")[1].replace(' ', ''))
record_dist = int(input().split(":")[1].replace(' ', ''))

lower_bound = ( max_time - sqrt( max_time ** 2 - 4 * record_dist ) ) / 2
upper_bound = ( max_time + sqrt( max_time ** 2 - 4 * record_dist ) ) / 2
possible_distances = round(abs(lower_bound - upper_bound))

print(f">> {possible_distances}")