function Main(input) {
    var X = BigInt(input[0]);
    var y = 0;
    var money = 100n;

    while(X > money) {
        money = money + money / 100n;
        y = y + 1;
    }
    console.log(y);
}

Main(require("fs").readFileSync("/dev/stdin", "utf8").trim().split(/\n|\s/));