<reponame>RevansChen/online-judge
# Python - 3.6.0

test.assert_equals(f(1), 1)
test.assert_equals(f(100), 5050)

# Python - 3.6.0

test.assert_equals(f(1), 1)
test.assert_equals(f(100), 5050)
# Python - 3.6.0