function Main(input){
	var inp= input.split(' ').map(function(x){ return Math.sqrt(x) * 10000000000000 }),
        a = inp[0],
        b = inp[1],
        c = inp[2];
	console.log(a+b < c ? 'Yes' : 'No');
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));