gistfile1.txt

// Amount of Helium awarded at the end of the given zone.
function zone_helium(z, lead) {
	let level = (z - 19) * 1.35;
	let base = z >= 151 ? 10 : z >= 59 ? 5 : 1;
	let reward = Math.round(base * Math.pow(1.23, Math.sqrt(level))) + Math.round(base * level);
	reward *= lead && (z % 2 == 1) ? 2 : 1;
	return reward * Math.pow(1.005, z);
}

// Total helium from a run up to the given zone
function run_helium(z, lead) {
	let corruption_start = lead ? 151 : 60;
	let value = lead ? 0.15 : 0.075;
	let result = 0;
	for (let i = 21; i <= z; ++i) {
		let corrupt = Math.floor((i - corruption_start) / 3);
		corrupt = corrupt < 0 ? 0 : Math.min(corrupt + 2, 80);
		result += zone_helium(i, lead) * (1 + corrupt * value);
	}
	return result;
}

console.log('Lead: ', 2.5 * run_helium(180, true) + run_helium(190, true));
console.log('Corrupted: ', 2 * run_helium(190, false));