#include <bits/stdc++.h>
using namespace std;
ifstream f("stergeri.in");
ofstream g("stergeri.out");
int v[200000001], i, n, m, k, x, y, a;
int main()
{
    f >> n >> m >> k;
    a = n;
    for(i = 1; i <= n; ++ i) v[i] = i;
    while(m --)
    {
        f >> x >> y;
        for(i = y + 1; i <= a; ++ i) v[i - y + x - 1] = v[i];
        a = a - y + x + 1;
    }
    g << v[k];
    return 0;
}