FUNCTION F(n,x,y)
    IF n = 0 THEN
       LET F = x + y
    ELSE
       IF y = 0 THEN
          LET F = x
       ELSE
          LET F = F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y)
       END IF
    END IF
END FUNCTION

PRINT "F(2,1,1) = "; F(2, 1, 1)
PRINT "F(3,1,1) = "; F(3, 1, 1)
PRINT "F(2,2,1) = "; F(2, 2, 1)
END