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#include <bits/stdc++.h>
using namespace std;
const int N = 110;
int n, m;
int v[N][N], w[N][N], s[N];
int f[N];
int main() {
cin >> n >> m;
for (int i = 1; i <= n; i++) {
cin >> s[i];
for (int j = 1; j <= s[i]; j++)
cin >> v[i][j] >> w[i][j];
}
for (int i = 1; i <= n; i++)
for (int j = m; j >= 0; j--)
for (int k = 1; k <= s[i]; k++)
if (j >= v[i][k])
f[j] = max(f[j], f[j - v[i][k]] + w[i][k]);
printf("%d\n", f[m]);
return 0;
}