N,M,K=map(int,input().split())
X=list(map(int,input().split()))
G=[[] for _ in range(N)]

for _ in range(M):
    u,v=map(int,input().split())
    u-=1
    v-=1
    G[u].append(v)
    G[v].append(u)

def dfs(pos,depth,vis,dist):
    # print(pos,depth)
    dist[pos].add(depth)
    for nxt in G[pos]:
    # for nxt in range(N):
        if pos==nxt:continue
        if vis[nxt]:
            continue
        vis[nxt]=True
        dfs(nxt,depth+1,vis,dist)
        # vis[nxt]=False


dist=[]
for x in X:
    vis=[False for _ in range(N)]
    d=[set() for _ in range(N)]
    vis[x-1]=True
    dfs(x-1,0,vis,d)
    dist.append(d)

for j in range(N):
    s=dist[0][j]
    for i in range(1,K):
        s&=dist[i][j]
    if len(s)>0:
        print("Yes")
        exit()
print("No")