include <stdio.h>

#define MAXM 100000

int vector_x[MAXM];
int vector_y[MAXM];

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