#include <stdio.h>

int main(void){
    int Aw, Ab, Bw, Bb, C, D;
    scanf("%d %d %d %d %d %d", &Aw, &Ab, &Bw, &Bb, &C, &D);
    if(C>Ab){
        Aw -= C-Ab;
        Bw += C-Ab;
    }
    if(D>Bw){
        Aw += Bw;
    }else{
        Aw += D;
    }
    printf("%d\n", Aw);
    return 0;
}