int
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main()
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{
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int x;
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x = 0;
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x += 2;
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x += 2;
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if (x != 4)
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return 1;
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x -= 1;
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if (x != 3)
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return 2;
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x *= 2;
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if (x != 6)
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return 3;
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return 0;
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}
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