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#include <iostream>
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using namespace std;
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const int N=1010;
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int v[N],w[N],f[N];
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int n,m;
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int main()
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{
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scanf("%d%d",&n,&m);
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for(int i=1;i<=n;i++) scanf("%d%d",&v[i],&w[i]);
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for(int i=1;i<=n;i++)
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for(int j=m;j>=v[i];j--)
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{
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f[j]=max(f[j],f[j-v[i]]+w[i]);
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}
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printf("%d",f[m]);
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return 0;
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}
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