How to calculate complement number in java

NUMBER COMPLEMENTA complement of a number defined as bitwise inversion starting from highest order 1-bit change every 1 to 0 and every 0 to 1.for example n=5(decimal) = 101(binary) so the binary complement is =010(binary) = 2(decimal)
Constaints : n<=0<=100000
input : 50(110010)
output : 13(001101)

SOURCE : NumberComplement.java

static int getIntegerComplement(int n)
{
    int comp = 0;
    int rem=0;
    int count =0;
    
    if (n == 1)
    {      
        return 0;
    }
    else if(n == 0)
    {
        return 1;
    }
    while(n>1)
    {
    rem = n % 2;
    n= n / 2;
    if(rem==0)
      comp= (int) (comp+1*Math.pow(2, count));
    count++;
    }
    if(n == 0)
    {
        comp= (int) (comp+1*Math.pow(2, count));
    }
    
    
    return comp;
    }

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