#include<iostream>
#include<iomanip>
using namespace std;
class Workout{
    public:
    void diaplay(int arr[],int n){
        double cal=0;
        double min=0;
        for(int i=0;i<(n*2);i++){
            if(i%2==0){
                min+=arr[i];
            }
            else{
                min+=arr[i];
                
            }
        }
    }
};
int main(){
    string type;
    string id;
    string goal;
    int n;
    cin>>type>>id>>goal>>n;
    int arr[n*2];
    for(int i =0;i<(n*2);i++){
        cin>>arr[i];
        if(arr[i]<=0){
            cout<<"Invalid input";
            return 0;
        }
    }
    Workout obj;
    obj.display(arr,n);
    return 0;
    
}