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Given a positive integer N, calculate the sum of all positive integers from 1 up to N, inclusive. That is, compute 1 + 2 + 3 + ... + N.
A single line containing the integer N.
A single line containing the sum 1 + 2 + ... + N.
1 <= N <= 1000
5
15
The sum is 1 + 2 + 3 + 4 + 5 = 15.
10
55
The sum is 1 + 2 + ... + 10 = 55.
More in: Binary Search problems
# Read the input from stdin and print the answer. import sys def main(): data = sys.stdin.read().split() # your code here main()
