# This tosses a coin n times and counts the
# longest streak of Heads in a row
import random


def toss():
    if random.randint(0, 1) == 0:
        return "Heads"
    else:
        return "Tails"

def main():
    n = eval(input( "How many tosses?  " ))
    currentStreak = 0
    maximumStreak = 0
    for x in range(0, n):
        t = toss()
        if t == "Heads":
            currentStreak = currentStreak + 1
            if currentStreak > maximumStreak:
                maximumStreak = currentStreak
        else:
            currentStreak = 0
    print("The longest streak of Heads in %d tosses was %d"%(n, maximumStreak))

main()