"use strict";
const input = require("fs").readFileSync("/dev/stdin", "utf8").trim();
const line = input.split('\n')[0].split(' ');
const a = +line[0];
const b = +line[1];
const c = +line[2];

const d = c - a - b;

if (d > 0 && 4 * a * b < d * d) {
    console.log('Yes');
} else {
    console.log('No');
}
