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#include <bits/stdc++.h>
using namespace std;
ifstream fin ("rucsac.in");
ofstream fout ("rucsac.out");
const int kN = 1e4 + 5;
int dp[2][kN];
int g[kN], v[kN];
int n, G;
int main(){
ios_base::sync_with_stdio(false);
fin >> n >> G;
for (int i = 1; i <= n; i++){
fin >> g[i] >> v[i];
}
for (int i = 1; i <= n; i++){
for (int j = 0; j <= G; j++){
dp[i % 2][j] = dp[1 - i % 2][j];
if (j - g[i] >= 0){
dp[i % 2][j] = max(dp[i % 2][j], dp[1 - i % 2][j - g[i]] + v[i]);
}
}
}
fout << dp[n % 2][G];
}