~cpp
begin real procedure A(k, x1, x2, x3, x4, x5);
value k; integer k;
begin real procedure B;
begin k := k - 1;
B := A := A(k, B, x1, x2, x3, x4)
end;
if k <= 0 then A := x4 + x5 else B
end;
end;
outreal(A(10, 1, -1, -1, 1, 0));