const n = +require("fs").readFileSync("/dev/stdin", "utf8");

const result = new Set();
const digits = [...`${n}`];
for (let i = 0; i <= digits.length; i++) {
  for (let j = i === 0 ? 1 : 0; j < 10; j++) {
    const next = [
      ...digits.slice(0, i),
      j,
      ...digits.slice(i),
    ];
    result.add(next.join(''));
  }
}

console.log(result.size);