#include <bits/stdc++.h>
#define ll long long
#define db long double
#define N 500005
#define II pair <ll,ll>
#define III pair <ll,II>
#define IV pair <vector <int>,vector <int> >
#define fst first
#define snd second
#define BIT(x,i) ((x>>i)&1)
#define pi acos(-1)
#define to_radian(x) (x*pi/180.0)
#define to_degree(x) (x*180.0/pi)
using namespace std;
int n,r,w,ori[N],m,i,res,pos,target[N],b[N];
II a[N];
int label(int k)
{
return 1-(k<w)+(k>w);
}
struct pt { int pos,jump; };
pt cal(int x)
{
//Init
if(w>n+1) while(1) {};
int i;
for(i=1;i<x;i++) a[i]={ (i-1)/2,label(ori[i]) };
a[x]={ (x-1)/2,label(w) };
for(i=x;i<=2*n-1;i++) a[i+1]={ i/2,label(ori[i]) };
m=2*n;
int cur1=a[1].snd,cur2=a[2].snd,cnt[3],j=3,jump=0;
memset(cnt,0,sizeof(cnt));
for(i=1;i<=3*n;i++)
{
//Find the winner and loser in target 1
if(cur1>cur2) swap(cur1,cur2);
a[++m]={ i+n-1,cur2 };
jump+=(cur2==1);
// cerr<<cur1<<" "<<cur2<<'\n';
// Find next archer go to target 1
while(j<=m && a[j].fst<=i) cnt[a[j++].snd]++;
int to_1;
if(cnt[0]) to_1=0; else if(cnt[1]) to_1=1; else to_1=2;
cur2=to_1; cnt[to_1]--;
if(i>=2*n && ((cur1==1) || (cur2==1)))
{
int to_r=r-i,to_r_mod=(r-i+n)%n;
if(to_r_mod==0) to_r_mod=n;
if(i>=r) return { n-to_r_mod+1,jump };
return { n-to_r_mod+1,jump+1+(to_r-1)/n };
}
}
}
int Final(int x)
{
int m=0,i;
for(i=1;i<x;i++) b[++m]=ori[i];
b[++m]=w;
for(i=x;i<=2*n-1;i++) b[++m]=ori[i];
for(i=1;i<=2*n;i++) target[b[i]]=(i-1)/2;
for(int step=1;step<=r;step++)
{
// for(i=1;i<=m;i++) cout<<b[i]<<" "<<target[b[i]]<<'\n';
// cout<<'\n';
if(b[1]<b[2]) target[b[2]]=n-1; else target[b[1]]=n-1;
for(i=3;i<=m;i+=2)
if(b[i]<b[i+1]) target[b[i]]--; else target[b[i+1]]--;
sort(b+1,b+m+1,[&](int i,int j){ return target[i]<target[j]; });
}
return target[w];
}
int main()
{
// freopen("archery.inp","r",stdin);
//freopen("archery.out","w",stdout);
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
cin>>n>>r>>w;
for(i=1;i<=2*n-1;i++) cin>>ori[i];
// for(pos=1;pos<=2*n;pos++) cout<<(pos+1)/2<<" "<<Final(pos)+1<<'\n';
// cerr<<Final(100);
if(w==1) { cout<<1; return 0; }
// cerr<<cal(8).pos; return 0;
int l=cal(2*n).jump,r=cal(1).jump;
res=2*n+1;
for(i=l;i<=r;i++)
{
int l=1,r=2*n;
while(l<r)
{
int mid=(l+r+1)>>1;
pt x=cal(mid);
if(x.jump>=i) l=mid; else r=mid-1;
}
pt x=cal(l);
if(x.jump==i && (res>x.pos || (res==x.pos && pos<l)))
{
res=x.pos;
pos=l;
}
}
cout<<(pos+1)/2;
}
