Given an input vector and position (which is zero based) output the value
x = [1 2; 4 5] pos = [0 1] value = 5
x = [1 2 3 4 5; 6 7 8 9 0] pos = [1 3] value = 9
Find the sum of all the numbers of the input vector
Project Euler: Problem 10, Sum of Primes
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