let answer = 0;

// function check(m, d) {
//     //console.log(m);
//    // console.log( d + 'の分解：' + Math.floor(d / 10) + ' , ' + d % 10);
//   //課題1. happy day なら日付を出力するコードを書いてみよう
//      if (m === Math.floor(d / 10) + (d % 10)) {
//         //console.log(m + ' ' + d);
//         answer = answer + 1;
//     }
// }

for (let m = 1; m <=12; m++) {
    if (m === 1 || m === 3 ||m === 5 || m === 7 || m === 8 || m === 10 || m === 12) {
        for (let d = 1; d <= 31; d++) {
            if (m === Math.floor(d / 10) + (d % 10)) {
                //console.log(m + ' ' + d);
                answer = answer + 1;
            }
        }
    } else if (m === 4 || m === 6 || m === 9 || m === 11) {
        for (let d = 1; d <= 30; d++) {
            if (m === Math.floor(d / 10) + (d % 10)) {
                //console.log(m + ' ' + d);
                answer = answer + 1;
            }
        }
    } else {
        for (let d = 1; d <= 28; d++) {
            if (m === Math.floor(d / 10) + (d % 10)) {
                //console.log(m + ' ' + d);
                answer = answer + 1;
            }
        }
    }
}

console.log(answer);