a= input().split()

l = int(a[0])
h = int(a[1])
ω = int(a[2])

g = 9.81
ω = ω * 2 * 3.14159 / 60
t = (h / 100) / (g * 0.5)
x = ω * t * l

if x % l <= l/2:
    print("butter")
else:
    print("bread")