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#include <bits/stdc++.h>
using namespace std;
const int N = 110;
const int INF = 0x3f3f3f3f;
/*
个数  空间至少5 
体积  价值
求: 最小价值
1 5
1 1
---
再来一组数据
个数  空间至少5 
体积  价值
求: 最小价值
3 5
1 2
4 9
3 6
答案10
*/
int n, m;
int f[N][N];
int main() {
scanf("%d %d", &n, &m);
memset(f, 0x3f, sizeof f);
f[0][0] = 0;
//这么写是可以选择多个的,也就是完全背包!!!
for (int i = 1; i <= n; i++) {
int v, w;
scanf("%d %d", &v, &w);
for (int j = 0; j <= m; j++)
f[i][j] = min(f[i - 1][j], f[i][max(0, j - v)] + w); //即使物品体积比j大j - v < 0也能选等价于f[i - 1][0]
}
printf("%d\n", f[n][m]);
return 0;
}