#include <stdio.h>
#include <stdlib.h>
#define MAXN 1000000

#define BUF_SIZE 16384
char buf[BUF_SIZE];
int pbuf=BUF_SIZE;
FILE*fi,*fo;
inline char nextch(){
    if(pbuf==BUF_SIZE){
        fread(buf, BUF_SIZE, 1, fi);
        pbuf=0;
    }
    return buf[pbuf++];
}
inline long long nextnum(){
    long long a=0;
    char c=nextch();
    while((c<'0' || c>'9') && c!='-')
        c=nextch();
    int semn=1;
    if(c=='-'){
        semn=-1;
        c=nextch();
    }
    while('0'<=c && c<='9'){
        a=a*10+c-'0';
        c=nextch();
    }
    return a*semn;
}

struct del{
    int left, right;
} v[100000];

int main(){
    fi=fopen("stergeri.in","r");
    fo=fopen("stergeri.out","w");
    int n=nextnum(), m=nextnum(), k=nextnum();
    for(int i=0;i<m;i++){
        v[i].left=nextnum();
        v[i].right=nextnum();
    }
    //printf("%d ", k);
    for(int i=m-1;i>=0;i--){
        if(v[i].left>k){
            ///aista caz ii ez
        }
        else if(v[i].right<k)
            k+=v[i].right-v[i].left+1;
        else
            k+=v[i].right-v[i].left+1;
        //printf("%d ", k);
    }
    fprintf(fo,"%d", k);
    fclose(fi);
    fclose(fo);
    return 0;
}