N = list(input())
n = len(N)

st = set()
for v in range(1, 10):
    vec = [str(v)] + N[:]
    st.add("".join(vec))

for i in range(n):
    for v in range(10):
        vec = N[:(i+1)] + [str(v)] + N[(i+1):]
        st.add("".join(vec))
print(len(st))