import math
d = int(input())
x = int(input())
y = int(input())
c = math.sqrt(d * d + d * d)
p= ( d + d + c)/2
s = math.sqrt(p*(p-d)*(p-d)*(p-c))
r1 = math.sqrt(x*x + y*y)
r2 = math.sqrt(x*x + (d-y) ** 2)
r3 = math.sqrt((d-x) ** 2 + y*y)
p1= ( r1 + r2 + d)/ 2
s1 = math.sqrt(p1*(p1-r1)*(p1-r2)*(p1-d))
p2 = ( r1 + r3 + d)/ 2
s2 = math.sqrt(p2*(p2-r1)*(p2-r2)*(p2-d))
p3 = ( r2 + r3 + c)/ 2
s3 = math.sqrt(p3*(p3-r2)*(p3-r3)*(p3-c))
so=s1+s2+s3
if s == so :
    print('1')
else:
    print ('0')