function histogram(input) {
    let n = +(input.shift());
    let p1 = 0;
    let p2 = 0;
    let p3 = 0;
    let p4 = 0;
    let p5 = 0;
    let n1 =0;
    let n2 =0;
    let n3 =0;
    let n4 =0;
    let n5 =0;

    for (let i = 0; i < n; i++) {
        num = +(input[i]);
        if (num < 200) {
            p1++;
        } else if (num <= 399) {
            p2++;
        } else if (num >= 400 && num <= 599) {
            p3++;
        } else if (num >= 600 && num <= 799) {
            p4++;
        } else if (num >= 800) {
            p5++;
        }
    }
    console.log(`${(n1 = p1/n * 100).toFixed(2)}%`);
    console.log(`${(n2 = p2/n * 100).toFixed(2)}%`);
    console.log(`${(n3 = p3/n * 100).toFixed(2)}%`);
    console.log(`${(n4 = p4/n * 100).toFixed(2)}%`);
    console.log(`${(n5 = p5/n * 100).toFixed(2)}%`);
}