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(x1 + x2 → x3 * y1) → y2 = 1

(x2 + x3 → x4 * y2) → y3 = 1

(x3 + x4 → x5 * y3) → y4 = 1

(x4 + x5 → x6 * y4) → y5 = 1

(x5 + x6 → x7 * y5) → y6 = 1

(x6 + x7 → x8 * y6) → y7 = 1

time 1000 ms
memory 32 Mb
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