/* eslint no-console: "off" */

function div_ceil(a, b) {
    return Math.trunc(a/b) + ((((a<0)^(b>0)) && a%b) ? 1 : 0);
}

function div_floor(a, b) {
    return Math.trunc(a/b) + ((((a>0)^(b>0)) && a%b) ? 1 : 0);
}

const DOMS = [
    -1,
    31, 28, 31, 30, 31, 30,
    31, 31, 30, 31, 30, 31,
];

function digit_sum(n) {
    let res = 0;
    while(n > 0) {
        res += n % 10;
        n = div_floor(n, 10);
    }
    return res;
}

function is_ok(m, d) {
    return m == digit_sum(d);
}

function Main(input) {
    let ans = 0;

    for(let m = 1; m <= 12; ++m) {
        let dom = DOMS[m];
        for(let d = 1; d <= dom; ++d) {
            if(is_ok(m,d))
                ++ans;
        }
    }

    console.log(ans);
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));