find the sum of first 16 natural numbers
"explanation : sum of n natural numbers = n ( n + 1 ) / 2 = 16 ( 16 + 1 ) / 2 = 16 ( 17 ) / 2 = 136 answer : option a"
add(divide(divide(16, divide(divide(divide(divide(divide(16, const_2), const_2), const_2), const_2), const_2)), const_2), add(const_1, sqrt(divide(divide(16, divide(divide(divide(divide(divide(16, const_2), const_2), const_2), const_2), const_2)), const_2))))