function successor() {
	var argument = document.successorValue.argument.value;
	var variable = parseFloat(argument);
	var first = 5 * Math.pow(variable, 2);
	var second = Math.sqrt(first);
	var third = (variable + second + 1)/2;
	var over = Math.floor(third);
	document.successorValue.output.value = over;
	}