Node.js)백준 17175번: 피보나치는 지겨웡~

https://www.acmicpc.net/problem/17175

//https://www.acmicpc.net/problem/17175
const N = +require('fs').readFileSync('./dev/stdin').toString();
if (N < 2) {
	console.log(1);
	process.exit();
}

const MOD = 1_000_000_007;
let temp1 = 1;
let temp2 = 1;
let temp3;
for (let i = 2; i <= N; i++) {
	temp3 = (temp1 + temp2 + 1) % MOD;
	temp1 = temp2;
	temp2 = temp3;
}
console.log(temp3);