#/***********************************************************
#    tarai.rb -- たらいまわし関数
#***********************************************************/

def tarai(x,  y,  z)
    if (x <= y); return y; end
    return tarai(tarai(x - 1, y, z),
                 tarai(y - 1, z, x),
                 tarai(z - 1, x, y))
end

printf("x = ");  x = gets.to_i
printf("y = ");  y = gets.to_i
printf("z = ");  z = gets.to_i
printf("tarai(x, y, z) = %d\n", tarai(x, y, z))

exit 0