import fileinput
def D(a):print(a)
def S(s,I):return int(s.split(" ")[I])
def main():
    z=0
    A=0
    N=0
    T=0
    for l in fileinput.input():
        z+=1
        if(z<2):
            N=int(l)
            A=[0]*N
            continue
        A[S(l,0)-1]+=1
        A[S(l,1)-1]+=1
    for i in A:T+=max(0,i-2)
    D(T)
main()