#include <iostream> #include <vector> #include <string> #include <cstring> #include <algorithm> #include <sstream> #include <map> #include <set> #define REP(i,k,n) for(int i=k;i<n;i++) #define rep(i,n) for(int i=0;i<n;i++) #define INF 1<<30 #define pb push_back #define mp make_pair using namespace std; typedef long long ll; typedef pair<int,int> P; int main() { int aw,ab,bw,bb; cin >> aw >> ab >> bw >> bb; int c,d; cin >> c >> d; int ans = aw; c -= ab; if(c > 0) { ans -= c; bw += c; } ans += min(bw,d); cout << ans << endl; return 0; }