题解 | #挑7#

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 n = 0;
        for(let i = 1; i<= line; i++){
            if(String(i).includes('7') || i%7 == 0) {n++}
        }
        console.log(n);
    }
}()