"use strict";
function main(input) {
  let kari = input[0].trim().split(" ");
 
  let a = parseInt(kari[0]);
  let b = parseInt(kari[1]);
  let c = parseInt(kari[2]);
 
  console.log(((c-a-b<0)&&(4*ab<Math.pow(c-a-b,2)))?"Yes":"No");
}
main(require('fs').readFileSync('/dev/stdin', 'utf8').trim().split("\n"));