#include <stdio.h>
int a[100000], b[100000];
int main()
{
    FILE *fi=fopen("stergeri.in", "r"), *fo=fopen("stergeri.out", "w");\
    int n, m, k;
    fscanf(fi, "%d%d%d", &n, &m, &k);
    for(int i=0;i<m;i++)
        fscanf(fi, "%d%d", &a[i], &b[i]);
    for(int i=m-1;i>=0;i--)
        if(a[i]<=k)
            k=k+b[i]-a[i]+1;
    fprintf(fo, "%d", k);
    fclose(fi);
    fclose(fo);
    return 0;
}