#include<fstream>
using namespace std;
#define Mmax 100005

ifstream fin("stergeri.in");
ofstream fout("stergeri.out");

int n, m, k, i, dr[Mmax], st[Mmax];
int main()
{
    fin >> n >> m >> k;
    for(i = 1; i <= m; ++i){
        fin >> st[i] >> dr[i];
    }

    for(i = m; i >= 1; i--)
        if(k >= st[i] )
            k = k + dr[i] - st[i] + 1;
    fout << k;
    return 0;
}