import sys
import heapq
input = sys.stdin.readline
def read_values(): return map(int, input().split())
def read_index(): return map(lambda x: int(x) - 1, input().split())
def read_list(): return list(read_values())

class MaxFlow:
    def __init__(self,n):
        self.g = [list() for _ in range(n)]
        self.r = [list() for _ in range(n)]
        self.f = [list() for _ in range(n)]
        self.mc=[False]*n
        self.size=n
        self.q=[-1]*n
        self.e=0

    def add(self,u,v,c):
        self.g[u].append(v)
        self.g[v].append(u)
        self.r[u].append(len(self.f[v]))
        self.r[v].append(len(self.f[u]))
        self.f[u].append(c)        
        self.f[v].append(0)
        self.e+=1        

    def bfs(self,s,t):
        self.depth=[-2]*self.size
        self.depth[s]=0
        self.q[0]=s
        l=0
        r=1
        while(l<r):
            v=self.q[l]
            l+=1
            for i in range(len(self.g[v])):
                v2=self.g[v][i]
                if(self.depth[v2]==-2 and self.f[v][i]>0):
                    self.depth[v2]=self.depth[v]+1
                    if(v2==t):return
                    self.q[r]=v2
                    r+=1

    def dfs(self,v,t,f):
        if(v==t):return f
        r=0
        for i in range(self.pg[v],len(self.g[v])):
            self.pg[v]=i
            v2=self.g[v][i]
            i2=self.r[v][i]
            if(self.f[v][i]==0 or self.depth[v]+1!=self.depth[v2]):continue
            d=self.dfs(v2,t,min(f-r,self.f[v][i]))
            if(d==0):continue
            self.f[v][i]-=d
            self.f[v2][i2]+=d
            r+=d
            if(r==f):break
        self.depth[v]=self.size
        return r
    
    def flow(self,s,t):
        r=0
        while(1):
            self.bfs(s,t)
            if(self.depth[t]==-2):return r 
            if(self.depth[t]*self.depth[t]*2>self.e):break
            self.pg=[0]*self.size
            f = self.dfs(s,t,10**18)
            if(f==0):break
            r+=f
        while(1):
            self.fi=[False]*self.size
            f = self.dfs2(s,t,10**18)
            if(f==0):break
            r+=f
        return r

def main():
    n,s,t=read_values()
    a=read_list()
    b=read_list()
    mf=MaxFlow(n+2)
    for v in a:
        mf.add(n,v-1,10**18)
    for v in b:
        mf.add(v-1,n+1,10**18)
    for i in range(n):
        c=read_list()
        for j in range(n):
            mf.add(i,j,c[j])
    print(mf.flow(n,n+1))
        
if __name__ == "__main__":
    main()