Number of four digit numbers between 5000 and 6000 such that the digit in 1000 's  place is equal to the sum of other three digits is

The four digit numbers starts with 5in thousand place the digit is 5, the possible three digits are (0,1,4), (0,2,3), - 12 numbers(0,0,5) - 3 numbers (1,2,2) - 3 numbers(1,1,3) - 3 numberstotal 21 numbers