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#include <bits/stdc++.h>
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using namespace std;
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const int N = 110;
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const int INF = 0x3f3f3f3f;
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/*
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个数 空间至少5
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体积 价值
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求： 最小价值
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3 5
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1 2
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4 9
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3 6
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答案应该是：11。 即 1,4-->2+9=11
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*/
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int n, m;
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int f[N];
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int main() {
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scanf("%d %d", &n, &m);
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memset(f, 0x3f, sizeof f);
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f[0] = 0;
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// 01背包！！！
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for (int i = 1; i <= n; i++) {
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int v, w;
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scanf("%d %d", &v, &w);
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for (int j = m; j >= v; j--)
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f[j] = min(f[j], f[max(0, j - v)] + w);
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}
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printf("%d\n", f[m]);
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return 0;
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}
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