int n;
   float sum=0;
   string m;
   cout<<"par or seq:";
   cin >> m;
    cout<<"enter number of input:";
   cin >> n;
   float input[n];
   if(m=="seq")
   {
   for(int i=n; i>=1;i--){
       cout<<"enter num:";
       cin>> input[i];
       sum += input[i];
       
   }
   cout<<"output is:"<<sum;
   }
   if(m=="par")
   {
   for(int i=n; i>=1;i--){
       cout<<"enter num:";
       cin>> input[i];
       sum += 1/input[i];
       
   }
   cout<<"output is:"<<1/sum;
   }