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#include <bits/stdc++.h>
using namespace std;
int dp[2][10005], i, j, p, gr, n, g;
int main()
{
freopen("rucsac.in", "r", stdin);
freopen("rucsac.out", "w", stdout);
scanf("%d%d", &n, &g);
for(i = 1; i <= n; i++)
{
scanf("%d%d", &gr, &p);
for(j = 1; j <= g; j++)
{
dp[i & 1][j] = dp[1 - (i & 1)][j];
if(j >= gr)
dp[i & 1][j] = max(dp[i & 1][j], dp[1 - (i & 1)][j - gr] + p);
}
}
printf("%d\n", dp[1 - (i & 1)][g]);
return 0;
}