find the volume of the solid that lies below paraboloid z=4-x^2-y^2, above the xy-plane and inside the cylinder (x-1)^2 + y^2 =1

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?