Problem
Problem of the Day #67
Points A_1, A_2, A_3, A_4, and A_5 lie on a plane, given that the length of A_1A_2 = 1, A_2A_3 = 2, A_3A_4 = 3, A_4A_5 = 4. Find the sum of all possible positive integers values of A_1A_5.
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