import strutils, sets

let n = stdin.readLine.strip

var resultSet = initHashSet[string]()

for pos in 0..len(n):
    for d in 0..9:
        if pos == 0 and d == 0:
            continue
        let newN = n[0..<pos] & d.intToStr & n[pos..<len(n)]
        resultSet.incl(newN)

echo resultSet.len