const numDays = [31,28,31,30,31,30,31,31,30,31,30,31]
let count = 0;
for (var i = 0; i < 12; i++) {
  const month = i+1
  for (var j = 1; j < numDays[i]; j++) {
    let sum = j < 10 ? j : Math.floor(j/10)+j%10
    if (sum == month)
       count++;
  }
}
console.log(count)