#include <stdio.h>
#include <stdlib.h>

int v[2][100000];
int main(){
    int n, m, k;
    FILE*fi,*fo;
    fi=fopen("stergeri.in","r");
    fo=fopen("stergeri.out","w");
    fscanf(fi,"%d%d%d", &n, &m, &k);
    for(int i=0;i<m;i++)
        fscanf(fi,"%d%d", &v[0][i], &v[1][i]);
    for(int i=m-1;i>=0;i--)
        if(k>=v[0][i])
            k+=v[1][i]-v[0][i]+1;
    fprintf(fo,"%d", k);
    fclose(fi);
    fclose(fo);
    return 0;
}