import sys
input = sys.stdin.readline

N,M,K,s,t=map(int,input().split())

E=[[] for i in range(N+1)]

for i in range(M):
    x,y=map(int,input().split())
    E[x].append(y)
    E[y].append(x)

if K==1:
    print("Yes")
    exit()

if E[s]==[] and E[t]==[]:
    print("No")
    exit()

if len(E[s])==1 and len(E[t])==1 and E[s][0]==t:
    flag=0
    USE=[-1]*(N+1)

    for i in range(1,N+1):
        if USE[i]!=-1:
            continue
        Q=[i]
        USE[i]=0

        while Q and flag==0:
            x=Q.pop()
            for to in E[x]:
                if USE[to]==USE[x]:
                    flag=1
                    break
                if USE[to]==-1:
                    USE[to]=USE[x]^1
                    Q.append(to)

    if flag:
        print("Yes")
        exit()
                    
    if K%2==1:
        print("Yes")
    else:
        print("No")
    exit()

print("Yes")