class Test{
        public static void main(String[] args){
                int a, b, c;
                
                for(int i=1;i<=100;i++){
                        if(i%2==0){
                                a=-i;
                        }
                        else{
                                b=i;
                        }
                        
                        c=a+b;
                
                }
        }
}


굽신굽신