# Missing number from 1 to 100
def missingno(X):
    n = len(X)
    total = (n+1)*(n+2)/2
    sum_of_list = sum(X)
    return total - sum_of_list
missing_list = [1, 2, 4, 5]
missing_number = missingno(missing_list)
print("Missing no.", missing_number)

2a3b15508cbcd7b2950b11875a5dad6cc7800a8e
<mask token>

def missingno(X):
    n = len(X)
    total = (n + 1) * (n + 2) / 2
    sum_of_list = sum(X)
    return total - sum_of_list


<mask token>

def missingno(X):
    n = len(X)
    total = (n + 1) * (n + 2) / 2
    sum_of_list = sum(X)
    return total - sum_of_list


<mask token>
print('Missing no.', missing_number)

def missingno(X):
    n = len(X)
    total = (n + 1) * (n + 2) / 2
    sum_of_list = sum(X)
    return total - sum_of_list


missing_list = [1, 2, 4, 5]
missing_number = missingno(missing_list)
print('Missing no.', missing_number)

# Missing number from 1 to 100
def missingno(X):
    n = len(X)
    total = (n+1)*(n+2)/2
    sum_of_list = sum(X)
    return total - sum_of_list
missing_list = [1, 2, 4, 5]
missing_number = missingno(missing_list)
print("Missing no.", missing_number)
