#include <fstream>
using namespace std;
ifstream cin("furnica.in");
ofstream cout("furnica.out");
struct foaie{
    long long l, h;
}a[10005];
long long cer, n, t;
int main(){
    cin >> cer;
    if(cer == 1 || cer == 2){
        cin >> n;
        for(int i = 1; i <= n; ++i)
            cin >> a[i].l >> a[i].h;
        if(cer == 1){
            long long sum = a[1].h * 5;
            for(int i = 1; i <= n; ++i){
                sum += 3 * a[i].l;
                if(a[i].h > a[i+1].h)
                    sum += 2 * (a[i].h - a[i+1].h);
                else
                    sum += 5 * (a[i+1].h - a[i].h);
            }
            cout << sum;
        }
        else{
            long long sum = a[1].h;
            long long smax = 0;
            for(int i = 1; i <= n; ++i){
                sum += a[i].l;
                if(a[i].h > a[i+1].h){
                    if(smax < sum)
                        smax = sum;
                    sum = 0;
                    continue;
                }
                else
                    sum += (a[i+1].h - a[i].h);
            }
            cout << smax;
        }
    }
    else{
        cin >> n >> t;
        for(int i = 1; i <= n; ++i)
            cin >> a[i].l >> a[i].h;
        long long sum = a[1].h * 5;
        for(int i = 1; i <= n; ++i){
            sum += 3 * a[i].l;
            if(sum >= t){
                cout << i;
                break;
            }
            if(a[i].h > a[i+1].h){
                sum += 2 * (a[i].h - a[i+1].h);
                if(sum >= t){
                    cout << i;
                    break;
                }
            }
            else{
                sum += 5 * (a[i+1].h - a[i].h);
                if(sum >= t){
                    cout << i+1;
                    break;
                }
            }
        }
    }
}