print("enter the value")
X=input()
N=X+1
M=N*X
C=M/2
print (C)

0293079f67984190d479e5efa4803bf5030b646b
<mask token>

print('enter the value')
<mask token>
print(C)

print('enter the value')
X = input()
N = X + 1
M = N * X
C = M / 2
print(C)

print("enter the value")
X=input()
N=X+1
M=N*X
C=M/2
print (C)
