import math

a,b,c = input().split()

left = int(a) + int(b)
right = int(c)

a = math.sqrt(int(a))
b = math.sqrt(int(b))
#c = math.sqrt(int(c))

left = left + 2*a*b


ans = ""

if(left< right):
    ans = "Yes"
else:
    ans = "No"

print(ans)