const total_attempts = 256*256*256;
var successful_attempts = 0;

for (var a = 0; a < 256; a++)
{
	for (var b = 0; b < 256; b++)
	{
		for (var c = 0; c < 256; c++)
		{
			if (a + b + c > 300)
				successful_attempts++;
		}
	}
}

console.log("Iterations: " + total_attempts);
console.log("Successful checks: " + successful_attempts);
console.log("Probability: " + (successful_attempts/total_attempts));