"use strict";

const main = (input) => {
    const spi = input.split('\n');
    const x = BigInt(spi[0]);

    let val = 100n, ans = 0;
    while (val < x) {
        val = (val*101n)/100n;
        ans++;
    }

    console.log(ans);
};

main(require("fs").readFileSync("/dev/stdin", "utf8"));
