def real(msg):
print(msg, end=''
value = float(input())
return value
def point(name):
p = Point()
print(name, end=''
p.x = real("x: "
print(name, end=''
p.y = real("y: "
return p
a = abs(real("a: ")
b = real("b: "
if b <= 0:
exit(0)
p = point("A"
if p.y <= 0 and p.radius() <= a:
print("Yes!"
elif p.belongs(a, b):
print("Yes!"
else:
print("No!"