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#include <bits/stdc++.h>
#define ll long long
#define INF 0x3F3F3F3F
using namespace std;
const string fisier = "energii";
ifstream fin (fisier + ".in");
ofstream fout (fisier + ".out");
const int N_MAX = 1e3 + 5 , M_MAX = 1e4 + 5;
int dp[N_MAX][M_MAX];
int n , w , g[N_MAX] , p[N_MAX];
int solve (){
for (int i=1; i<=n; i++){
dp[0][i] = 0;
}
for (int i=1; i<=n; i++){
for (int j=0; j<=w; j++){
dp[i][j] = dp[i - 1][j];
if (j - g[i] >= 0){
int sum = dp[i - 1][j - g[i]] + p[i];
dp[i][j] = max(dp[i][j] , sum);
}
}
}
return dp[n][w];
}
int main(){
ios_base::sync_with_stdio(false);
fin >> n >> w;
for (int i=1; i<=n; i++){
fin >> g[i] >> p[i];
}
fout << solve();
}