process.stdin.resume();
process.stdin.setEncoding('utf8');

var input_lines = [];
var reader = require('readline').createInterface({
  input: process.stdin,
  output: process.stdout
});

reader.on('line', (line) => {
  input_lines.push(line);
});

reader.on('close', () => {

    let lastDay = [31,28,31,30,31,30,31,31,30,31,30,31];
    let ct = 0;

    for (let i = 1; i <= 12; i++) {
        for (let j = 1; j <= lastDay[i-1]; j++) {
            let temp1 = i;
            let temp2 = Math.floor(j / 10) + (j % 10);
            if (temp1 === temp2) {
                ct++;
            }
        }
    }
    console.log(ct);


});