'use strict'

function main(input) {
    let sum = 100;
    let count = 0;
    const x = Number(input.split('\n')[0].split(' ')[0]);
    while(sum<x) {
        sum = parseInt(sum*1.01);
        count++;
    }
    console.log(count);
}

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