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    class MyCalculator{
        public long power (int n, int p) throws Exception{
            
            if(n==0 && p==0){
                throw new Exception("n and p should not be zero.");
            }else if(n<0 || p<0){
                throw new Exception("n or p should not be negative.");
            }else return (long)Math.pow(n,p);
            }
    
    }