#pragma GCC optimize("03")
#include <bits/stdc++.h>
#define ll long long
#define PII pair < int , int >
#define MOD 1000000007
#define PI 3.14159265359
 
using namespace std;
 
int n, m, k, x[101000], y[101000];
 
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    ifstream cin("stergeri.in");
    ofstream cout("stergeri.out");
    
    cin >> n >> m >> k;
    for (int i = 1; i <= m; i++) {
        cin >> x[i] >> y[i];
    }

    for (int i = m; i; i--) {
        if (k >= x[i]) k += y[i] - x[i] + 1;
    }

    cout << k;
    
    return 0;
}