#include <iostream>
#include <cstdio>
#include <cstring>

using namespace std;
typedef long long lg;
#define min(a,b) (a>b?b:a)
#define max(a,b) (a>b?a:b)
#define MAXX 200011

int n,k,p,c,s[51][MAXX],ans=0,pre=0;

int main(int argc, char** argv)
{
   freopen("hotel.in","r",stdin);
   freopen("hotel.out","w",stdout);
   ios::sync_with_stdio(0);
   cin>>n>>k>>p;
   int x,y;
   for(int i=1;i<=n;i++)
   {
   	 cin>>x>>y;
   	 x++;
   	 s[x][i]=s[x][i-1]+1;
   	 for(int j=1;j<=k;j++)
   	 	if(j!=x)
   	 		s[j][i]=s[j][i-1];
     if(y<=p)
     	ans+=s[x][i]-1,pre=i;
     else
	    ans+=s[x][pre];
   }
   cout<<ans;
   return 0;
}