sum = 0
for i in range(3, 51):
sum += i * (i + 1)
print("Sum:", sum)
sum=0
sum +=i *(i+1)
print("Sum:",sum)
sum = 0
for i in range(3, 51):
sum += i * (i + 1)
print("Sum:", sum)
sum=0
for i in range(3, 51):
sum +=i *(i+1)
print("Sum:",sum)