function main() {
    const days = [-1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
    let a = 0;
    for (let m = 1; m <= 12; ++m) {
	for (let d = 1; d <= days[m]; ++d) {
	    if (m == Math.floor(d / 10) + d % 10)
		++a;
	}
    }
    console.log(a);
}

main();