题解 | #挑7#
挑7
https://www.nowcoder.com/practice/ba241b85371c409ea01ac0aa1a8d957b
const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;
void async function () {
const n = parseInt(await readline());
let cnt = 0;
for(let i = 1; i <= n; i++){
if(i%7===0 || String(i).indexOf(7)!=-1) cnt++;
}
console.log(cnt);
}()
