#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vll = vector<ll>;
using vvll =vector<vll>;
#define all(A) A.begin(),A.end()
#define rep(i, n) for (ll i = 0; i < (ll) (n); i++)


bool chmax(ll& p, ll q) {
    if (p < q) {
        p = q;
        return 1;
    }
    else {
        return 0;
    }
}

bool chmin(ll& p, ll q) {
    if (p > q) {
        p = q;
        return 1;
    }
    else {
        return 0;
    }
}


int main() {
    
    ll N,V,C;cin>>N>>V>>C;
    
    vll A(N),B(N);
    rep(i,N)cin>>A[i]>>B[i];

    vvll DP(N+1,vll(V+1,-1e18));
    DP[0][0]=0;
    rep(i,N){
        rep(v,V+1){
            chmax(DP[i+1][v],DP[i][v]);
            if(v+A[i]<=V){
                chmax(DP[i+1][v+A[i]],DP[i][v]+B[i]+C);
            }
        }
    }
    vvll DP2(N+1,vll(V+1,-1e18));
    DP2[0]=DP[N];
    rep(i,N){
        rep(v,V+1){
            chmax(DP2[i+1][v],DP2[i][v]);
            if(v+A[i]<=V){
                chmax(DP2[i+1][v+A[i]],DP2[i][v]+B[i]);
                chmax(DP2[i+1][v+A[i]],DP2[i+1][v]+B[i]);
            }
        }
    }
    ll an=0;
    rep(v,V+1)chmax(an,DP2[N][v]);
    cout<<an<<endl;

    
}