76. 单行道汽车通行时间

const readline = require('readline');
const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
});
let lines = [];
rl.on('line', function(line) {
    lines.push(line);
});

rl.on('close', () => {
    const [M, N] = lines[0].split(' ').map(Number);
    const speeds = lines.slice(1, M + 1).map(Number);
    const time = new Array(M);
    time[0] = N/speeds[0];
    for(let i=1; i<M; i++) {
        let n = N/speeds[i] + i;
        time[i] = Math.max(n, time[i-1]);
    }
    // -M+1 车辆从0开始计数，时间从1开始计数的。没搞懂？
    console.log(time[M - 1] - M + 1)

})