let ans = 0;

let plus = x => {
    x = String(x);
    while (x.length < 2) {
        x += "0" + x;
    }
    return Number(x[0]) + Number(x[1]);
}
    
for(let i = 1; i <= 12; i++) {
    let last = 31;
    if (i === 4 || i === 6 || i === 9 || i === 11) {
        last = 30;
    } else if (i === 2) {
        last = 28;
    }
    for (let j = 1; j <= last; j++) {
        if (i === plus(j)) {
            ans++;
        }
    }
}

console.log(ans);