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Given the following text description, write Python code to implement the functionality described.
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Description:
Given a positive integer N, return the total sum of its digits in binary.
    
    Example
        For N = 1000, the sum of digits will be 1 the output should be "1".
        For N = 150, the sum of digits will be 6 the output should be "110".
        For N = 147, the sum of digits will be 12 the output should be "1100".
    
    Variables:
        @N integer
             Constraints: 0 ≤ N ≤ 10000.
    Output:
         a string of binary number
    
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Python Code:
def solve(N):
    
    return bin(sum(int(i) for i in str(N)))[2:]
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