#include<stdio.h>
#define MAXQueries 100001
FILE*fin=fopen("stergeri.in","r");
FILE*fout=fopen("stergeri.out","w");
struct Vector2
{
    int x,y;
};
Vector2 Q[MAXQueries];
int main()
{
    int N,M,K;
    fscanf(fin,"%d%d%d",&N,&M,&K);
    for(int i=1;i<=M;i++)
    {
        fscanf(fin,"%d%d",&Q[i].x,&Q[i].y);
    }
    for(int i=M;i>=1;i--)
    {
        if(K>=Q[i].x)
        {
            K+=(Q[i].y-Q[i].x)+1;
        }
    }
    fprintf(fout,"%d",K);
}