n = int(input())

m = str(n)
mm = len(m)
s = set()
for i in range(mm+1):
    if i == 0:
        for j in range(1,10):
            jj = str(j)
            s.add(jj+m)
    else:
        for j in range(0,10):
            jj = str(j)
            s.add(m[0:i]+jj+m[i:])
            
s = list(s)
print(len(s))