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#include<bits/stdc++.h> using namespace std; void chmax(int &a, int b) { if(a<b)a=b; return; } int N,M,X[2001],Y[20001],dp[20001][101]; int main(){ cin>>N>>M; for(int i=1; i<=N; i++)cin>>X[i]; for(int i=1; i<=N; i++)cin>>Y[i]; int ans=0,now=0; for(int i=1; i<=N; i++){ if(now+Y[i]<M) { ans+=X[i]; now+=Y[i]; } else break; } cout << ans << endl; }