for s in[*open(0)][1:]:x,y,z=map(int,s.split());x+=y;print(-(x+z&1)or x+min(x,z)>>1)1301C - Ayoub's function | 38E - Let's Go Rolling |
171G - Mysterious numbers - 2 | 1183C - Computer Game |
400C - Inna and Huge Candy Matrix | 417A - Elimination |
222A - Shooshuns and Sequence | 1736A - Make A Equal to B |
1736B - Playing with GCD | 887C - Solution for Cube |
1737C - Ela and Crickets | 1741C - Minimize the Thickness |
1741A - Compare T-Shirt Sizes | 1741D - Masha and a Beautiful Tree |
109B - Lucky Probability | 1741B - Funny Permutation |
1741E - Sending a Sequence Over the Network | 344B - Simple Molecules |
370A - Rook Bishop and King | 546E - Soldier and Traveling |
1741G - Kirill and Company | 1200B - Block Adventure |
1088B - Ehab and subtraction | 1270B - Interesting Subarray |
478C - Table Decorations | 1304C - Air Conditioner |
1311C - Perform the Combo | 1519C - Berland Regional |
361A - Levko and Table | 5E - Bindian Signalizing |