the missing number.py

'''
Find the missing number in the given list of integers. The list contains 1 to 100 integers but one of the integer is missing. There are no duplicates in the list.

Input Format

Input contains a list of 99 integers.

Constraints

1 <= L[i] <= 100

Output Format

Print the missing number in the list.

Sample Input 0

12 15 9 1 71 77 81 29 70 19 11 83 56 2 57 53 68 99 82 100 22 10 51 40 34 98 80 38 39 89 94 4 26 64 45 8 90 24 93 33 21 7 49 88 5 28 55 67 65 50 32 58 6 37 46 42 20 44 41 3 78 76 73 16 31 85 91 54 60 47 97 43 84 17 35 69 13 30 61 79 72 48 23 66 52 27 62 87 63 18 75 96 14 86 95 74 25 59 36 
Sample Output 0

92
Explanation 0

Self Explanatory
'''

numbers=list(map(int,input().split()))
answer=sum(numbers)
formula_answer=(100*101)//2
print(formula_answer-answer)