题解 | #杨辉三角的变形#

const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;

void async function () {
    // Write your code here
    while(line = await readline()){
        let tokens = line.split(' ');
        let a = parseInt(tokens[0]);
        // let b = parseInt(tokens[1]);
        if(a <= 2) { console.log(-1); break; }
        if(a % 2 == 1) { console.log(2); break; }
        if(a % 4 == 0) { console.log(3); break; }
        if(a % 4 == 2) { console.log(4); break; }
        // console.log(line);
    }
}()