BOJ 1748 #25
Description
n = input()
result = 0
for i in range(1,len(n)):
result+=9*10**(i-1)i
result +=(int(n)-10*(len(n)-1)+1)*len(n)
print(result)
{{ message }}
n = input()
result = 0
for i in range(1,len(n)):
result+=9*10**(i-1)i
result +=(int(n)-10*(len(n)-1)+1)*len(n)
print(result)