[백준] 20362

n,s=input().split()
n=int(n); s=str(s)
tmp=[]
for _ in range(n):
    a,b=input().split()
    if a==s: ans=b
    tmp.append((a,b))
cnt=0
for i in range(len(tmp)):
    if tmp[i][1]==ans:
        if tmp[i][0]!=s: cnt+=1
    if tmp[i][0] == s: print(cnt);break