```cpp
#include<bits/stdc++.h>
using namespace std;
int sij=0;
int main(){
    int n,p1,p2,p3,t1,t2,s=0,sum=0;
    cin>>n>>p1>>p2>>p3>>t1>>t2;
    for(int i=1;i<=n;i++){
        int l,r;
        cin>>l>>r;
        sum+=(r-l)*p1;
        sij=p1;
        if(i>1){
            int sj=0;
            sj = l - s;
            for(int j=1;j<=sj;j++){
                if(j<=t1){
                    sum+=sij;
                }else if(j>=t1&&j<t2){
                    sij=p2;
                    sum+=sij;
                }else if(j>=t2){
                    sij=p3;
                    sum+=sij;
                }else{
                    sij=p1;
                    sum+=sij;
                }
            }
        }
        s = r;
    }
    cout<<sum;
    return 0;
}