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#include <bits/stdc++.h>
using namespace std;
ifstream fin("lupu.in");
ofstream fout("lupu.out");
long long n , paslup, pasoaie, x, maxx, y, i, dist[100001], sol[100001], loc, j, k,suma;
int main()
{
fin>>n>>paslup>>pasoaie;
for(i=1;i<=n;i++){
fin>>x>>y;
maxx=max(x,maxx);
if(dist[x]<y)dist[x]=y;
}
for(i=maxx;i>=1;i--){
sol[++loc]=dist[i];
}
for(i=1;i<loc;i++){
for(j=i+1;j<=loc;j++){
if(sol[i]==sol[j]||sol[j]==0){
for(k=j;k<loc;k++){
sol[k]=sol[k+1];
}
loc--;
}
}
}
for(i=1;i<=loc;i++){
suma+=sol[i];
}
fout<<suma;
return 0;
}