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#include <bits/stdc++.h>
#define int long long
#define llu long long unsigned
#define ld long double
#define fr(i,n) for(int i=0;i<n;i++)
#define watch(x) cout<<(#x)<<"=="<<(x)<<endl
#define ft first
#define sc second
#define mp make_pair
#define pb push_back
#define vi vector<int>
#define pii pair<int,int>
#define N 1005
#define LC 262144
using namespace std;

int getchar_pos_int() {
    int n=0, c=getchar();
    while('0'<=c&&c<='9') {n=n*10+c-'0'; c=getchar();}
    return n;
}

vector<pii> occ, occ2;

signed main() {
    int n=getchar_pos_int(),m=getchar_pos_int(),s=getchar_pos_int(), mindist=INT64_MAX,res=INT64_MAX;
    fr(i,m) occ.pb({getchar_pos_int(),getchar_pos_int()});
    sort(occ.begin(),occ.end());
    occ2.pb(occ[0]);
    for(int i=1;i<m;i++) {
        if(occ[i].ft==occ2[occ2.size()-1].sc+1) {
            occ2[occ2.size()-1].sc=occ[i].sc;
        } else {
            occ2.pb(occ[i]);
        }
    }
    fr(i,m) if(occ2[i].ft<=s&&s<=occ2[i].sc) {
            if(occ2[i].ft>1) {
                mindist=abs(occ2[i].ft-1-s);
                res=occ2[i].ft-1;
            }
            if(occ2[i].sc<n&&abs(occ2[i].sc+1-s)<mindist) {
                res=occ2[i].sc+1;
            }
            break;
        }
    printf("%lld\n",res);
    return 0;
}