Score : 100 points
Snuke prepared 6 problems for a upcoming programming contest. For each of those problems, Rng judged whether it can be used in the contest or not.
You are given a string S of length 6.
If the i-th character of s is 1
, it means that the i-th problem prepared by Snuke is accepted to be used; 0
means that the problem is not accepted.
How many problems prepared by Snuke are accepted to be used in the contest?
0
and 1
.Input is given from Standard Input in the following format:
S
Print the number of problems prepared by Snuke that are accepted to be used in the contest.
111100
4
The first, second, third and fourth problems are accepted, for a total of four.
001001
2
000000
0