int foo (int x,int y ) { if (x<=0││y<=0) return 1; return 3*foo(x-6,y/2); }
3
9
27
81
foo(20,13) = 3 * foo(14,6) = 9 * foo(8,3) = 27 * foo(2, 1) = 81 * foo(-4, 0) = 81 * 1 = 81
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