"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
var fs_1 = __importDefault(require("fs"));
var input = fs_1.default.readFileSync('/dev/stdin', 'utf8').split('\n');
var x = +input[0];
var i = 1;
var sum = 100;
while (true) {
    sum += Math.floor(sum * 0.01);
    if (x <= sum) {
        break;
    }
    i++;
}
console.log(i);