x = True
a = []
index = 0

while x:
    getal = int(input())
    if (getal >= 0 and getal < 100):
        a.append(getal)
    else:
        x = False

getal = 0

while index < len(a):
    if a[index] > getal:
        getal = a[index]
    index += 1

print(getal)