
시간 초과 두둥
n = int(input())
sum = 0
for i in range(n):
j= int(input())
sum += j
answer = sum - (n-1)
print(answer)
import sys
n = int(sys.stdin.readline())
sum = 0
for i in range(n):
j= int(sys.stdin.readline())
sum += j
answer = sum - (n-1)
print(answer)