import math
a,b,c = map(int, input().split())

if(a>=c or b>=c):
  print("No")
else:
  r=round(math.sqrt(a),1000000000) + round(math.sqrt(b),1000000000)
  s=round(math.sqrt(c),1000000000)

  if(r<s):
    print("Yes")
  else:
    print("No")