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#define Y(x) Z(x)
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#define X Y
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X(1)
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X(X(1))
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X(X(X(X(X(1)))))
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#define A B
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#define B A
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return A + B;
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#undef A
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#undef B
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#define A B+1
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#define B A
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return A + B;
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#define A1 B1+1
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#define B1 C1+2
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#define C1 A1+3
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return A1 + B1;
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#define i() x
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#define n() 1
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i()i()n()n()i()
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i()+i()-n()+n()-
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