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def log_base_10(n):
if n == 0:
return float('-inf') # Logarithm of 0 is undefined
count = 0
while n >= 1:
n /= 10
count += 1
return count
if __name__ == '__main__':
n = 102
out = 0
for i in range(1, n + 1):
power = (i // 10 + 1)
# print(i, i / 10, log_base_10(i), pow(10, log_base_10(i) - 1), pow(10, power))
out = out * pow(10, log_base_10(i)) + i
print(out)