CCF December 2018 Question 1

#include <iostream>

using namespace std;

int main()
{
    
    
	int r,y,g;
	cin>>r>>y>>g;
	int n;
	cin>>n;
	int i,k,t;
	int sum=0;
	for(i=0;i<n;i++){
    
    
		cin>>k>>t;
		if(k==0){
    
    
			sum+=t;
		}
		if(k==1){
    
    
			sum=sum+t;
		}
		if(k==2){
    
    
			sum=sum+t+r;
		}
	}
	cout<<sum;
	return 0;
}