"use strict";
function Main(input) {
    const requestedQty = Number(input);
    //let leftOver:number
    const ans = (function (firstHits) {
        if (Number.isInteger(firstHits)) {
            return firstHits;
        }
        else {
            return Math.ceil(firstHits);
        }
    }(Math.log2(requestedQty)));
    console.log(ans);
}
//テストの入力を受け取る
Main(require("fs").readFileSync("/dev/stdin", "utf8"));
//Main("3");
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