11720

## 🔒 문제 001. 숫자의 합 구하기 #11720
n = int(input())
nums = input()
num_list = [0 for i in range(1, n+1)]

for i in range (1, n+1):
  num_list[i-1] = nums[i-1]

num_list_new = [int(i) for i in num_list]
t = sum(num_list_new)
print(t)

''' 모범 답안
n = input()
numbers = list(input())
sum = 0

for i in numbers:
  sum = sum + int(i)

print(sum)
'''