#include <bits/stdc++.h>
#define MAX 100000
FILE *fin, *fout;

int x[MAX], y[MAX];

int main()  {
    fin = fopen("stergeri.in", "r");
    fout = fopen("stergeri.out", "w");
    int n, m, k;
    fscanf(fin, "%d%d%d", &n, &m, &k);
    int i;
    for(i = 0;i < m;i++)
        fscanf(fin, "%d%d", &x[i], &y[i]);
    for(i = m - 1;i >= 0;i--)
        if(k >= x[i])
            k += y[i] - x[i] + 1;
    fprintf(fout, "%d", k);
    fclose(fin);
    fclose(fout);
    return 0;
}