def sum_all(start, end):
output = 0
for i in range(start, end + 1):
output += i
return output
print("0 to 100 :", sum_all(0, 100))
print("0 to 1000 :", sum_all(0, 1000))
print("50 to 100 :", sum_all(50, 100))
print("50 to 1000 :", sum_all(50, 1000))
0 to 100 : 5050
0 to 1000 : 500500
50 to 100 : 3825
50 to 1000 : 499275