50 gm of carbs for the rice.
Potato is about 15 percent carbs, so you'd need to calculate that from the weight - there will be carbs from the tomato and veges, but if you chose to regard them as zero it will not make that much of a difference with the heavyweights of rice and potatoes.
I can do carb counting - as I am totally diet controlled, so I am totally in the dark about what an ICB is - but there are resources online - though you need to be aware of the information from the US being the carbs including fibre, whilst the UK sites do not include the fibre. You can use the UK information as it, the US you need to deduct the fibre.