You need 4 cups of flour and 2 cups of sugar.
Can you bake cookies with 3 cups of flour and 2 cups of sugar?
No. You have enough sugar, but not enough flour, so you can't follow the recipe.
The question about whether you have enough ingredients has two parts:
You need at least 4 cups of flour AND You need at least 2 cups of sugar
Since you do not have enough flour, you don't have enough ingredients. (:<)
What if you had 9 cups of flour and 1 cup of sugar. Now could you follow the recipe?