Example

Input

6 3
1 0 0 1 0 1
1 3 2


Output

1
#include <bits/stdc++.h>
using namespace std;
#define all(c) (c).begin(),(c).end()
#define rrep(i,n) for(int i=(int)(n)-1;i>=0;i--)
#define REP(i,m,n) for(int i=(int)(m);i<(int)(n);i++)
#define rep(i,n) REP(i,0,n)
#define iter(c) __typeof((c).begin())
#define tr(it,c) for(iter(c) it=(c).begin();it!=(c).end();it++)
#define mem(a) memset(a,0,sizeof(a))
#define pd(a) printf("%.10f\n",a)
#define pb(a) push_back(a)
#define in(a) insert(a)
#define pi M_PI
#define R cin>>
#define F first
#define S second
#define C class
#define ll long long
#define ln cout<<'\n'
#define _(_1,_2,_3,N,...)N
#define pr(...) _(__VA_ARGS__,pr3,pr2,pr1)(__VA_ARGS__)
template<C T>void pr1(T a){cout<<a;ln;}
template<C T,C T2>void pr2(T a,T2 b){cout<<a<<' '<<b;ln;}
template<C T,C T2,C T3>void pr3(T a,T2 b,T3 c){cout<<a<<' '<<b<<' '<<c;ln;}
template<C T>void PR(T a,int n){rep(i,n){if(i)cout<<' ';cout<<a[i];}ln;}
bool check(int n,int m,int x,int y){return x>=0&&x<n&&y>=0&&y<m;}
const ll MAX=1000000007,MAXL=1LL<<60,dx[4]={-1,0,1,0},dy[4]={0,1,0,-1};
typedef pair<int,int> P;

void Main() {
  int n,m;
  cin >> n >> m;
  int a[n],b[m],k=0,kk[2]={0,0};
  rep(i,n) {
    R a[i];
    k+=a[i];
  }
  rep(i,m) {
    R b[i];
    kk[i%2]+=b[i];
  }
  int ans=MAX;
  rep(t,2) {
    if(k!=kk[t]) continue;
    int p=!t,d=0;
    int c[n],cc[n],cnt=0;
    rep(i,n) cc[i]=a[i];
    rep(i,m) {
      REP(j,d,d+b[i]) c[j]=p;
      d+=b[i];
      p^=1;
    }
    rep(i,n) {
      int j=i;
      while(j<n && cc[j]!=c[i]) {
        cnt++;
        j++;
      }
      swap(cc[j],cc[i]);
    }
    ans=min(ans,cnt);
  }
  pr(ans);
}

int main() {
  ios::sync_with_stdio(0);cin.tie(0);
  Main();return 0;
}
