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#include <bits/stdc++.h>
#define ull unsigned long long
#define ll long long
#define pb push_back
#define pf push_front
#define in insert
#define f first
#define s second
#define pii pair<int, int>
#define pib pair<int, bool>
#define cint const int
#define mn2 262144
#define nw '\n'
#define sp " "
#define mn 8009
#define inf 400009
#define int long long
using namespace std;
ll n, wyn, pref=-1, pres=-1, sz, bes=LLONG_MAX;
int  m;
vector<pair<ll, ll>> v;
// void check(int x, int y){
//     if(x>y){
//         int tmp=abs(sz-x);
//         //cout<<y<<" "<<tmp<<" \n";
//         if(tmp<bes){
//             wyn=x;
//             bes=tmp;
//         }
//         else if(tmp==bes) wyn=min(wyn, x);
//     }
// }
int32_t main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin>>n>>m>>sz;
    int a, b;
    for(int i=1; i<=m; ++i){
        cin>>a>>b;
        v.pb({a, b});
    }
    sort(v.begin(), v.end());
    int nxt, tmp;
    //cout<<nw;
    for(int i=0; i<m; ++i){
        pii it=v[i];
        //cout<<it.f<<" "<<it.s<<"\n";
        if(i>0) nxt=v[i-1].s;
        else nxt=0;
        if(it.f-1>nxt){
            tmp=abs(sz-(it.f-1));
            //cout<<nxt<<" "<<tmp<<" \n";
            if(tmp<bes){
                wyn=it.f-1;
                bes=tmp;
            }
            else if(tmp==bes) wyn=min(wyn, it.f-1);
        }
        if(i+1<m) nxt=v[i+1].f;
        else nxt=n+1;
        if(it.s+1<nxt){
            tmp=abs(sz-(it.s+1));
            //cout<<nxt<<" "<<tmp<<" \n";
            if(tmp<bes){
                wyn=it.s+1;
                bes=tmp;
            }
            else if(tmp==bes) wyn=min(wyn, it.s+1);
        }
        if(it.s<sz && sz<nxt){
            if(sz-1>it.s){
                tmp=abs(sz-1);
                cout<<nxt<<" "<<tmp<<" \n";
                if(tmp<bes){
                    wyn=sz-1;
                    bes=tmp;
                }
                else if(tmp==bes) wyn=min(wyn, sz-1);
            }
            else if(sz+1<nxt){
                tmp=abs(sz+1);
                cout<<nxt<<" "<<tmp<<" \n";
                if(tmp<bes){
                    wyn=sz+1;
                    bes=tmp;
                }
                else if(tmp==bes) wyn=min(wyn, sz+1);
            }
        }
        pref=it.f; pres=it.s;
        //cout<<nw<<nw;
    }
    cout<<wyn;
}