// Slower C++ solution:
#include<cstdio>

#include<cstring>

#include<algorithm>

#include<cmath>

#include<ctime>

#include<cstdlib>

#define cmax(a,b) (a<(b)?a=(b),1:0)

#define cmin(a,b) (a>(b)?a=(b),1:0)

#define dmin(a,b) ((a)<(b)?(a):(b))

#define dmax(a,b) ((a)>(b)?(a):(b))

#define CL fclose(stdin),fclose(stdout)

namespace io

{

	int F()

	{

		int n=0,F=1;

		char ch;

		while((ch=getchar())!='-'&&(ch<'0'||ch>'9'));

		ch=='-'?F=0:n=ch-'0';

		while((ch=getchar())>='0'&&ch<='9')n=(n<<1)+(n<<3)+ch-'0';

		return F?n:-n;

	}

	long long G()

	{

		long long n=0,F=1;

		char ch;

		while((ch=getchar())!='-'&&(ch<'0'||ch>'9'));

		ch=='-'?F=0:n=ch-'0';

		while((ch=getchar())>='0'&&ch<='9')n=(n<<1)+(n<<3)+ch-'0';

		return F?n:-n;

	}

}

struct edge

{

	int to;

	int next;

}e[333333];

int pe=111111;

int deg[111111];

void insert(int a,int to)

{

	e[pe]=(edge){to,e[a].next};

	e[a].next=pe++;

	deg[to]++;

}

int f[111111][4];//1:ex 2:ex0

void dfs(int o,int fa)

{

	if(deg[o]==1){f[o][2]=0,f[o][1]=1;return;}

	int g[4]={0,0x3f3f3f3f};

	int cnt=0,son;

	for(register int p=e[o].next;p;p=e[p].next)

		if(e[p].to!=fa)++cnt,son=e[p].to;

	if(cnt==1){dfs(son,o);memcpy(f[o],f[son],sizeof(f[o]));return;}

	if(cnt==2)

	{

		int c1=son,c2;

		for(register int p=e[o].next;p;p=e[p].next)

			if(e[p].to!=fa){c2=e[p].to;break;}

		dfs(c1,o);

		dfs(c2,o);

		int m1=0x3f3f3f3f,m2=0x3f3f3f3f;

		cmin(m1,f[c1][0]),cmin(m1,f[c1][1]),cmin(m1,f[c1][3]);

		cmin(m2,f[c2][0]),cmin(m2,f[c2][1]),cmin(m2,f[c2][3]);

		f[o][1]=m1+m2;

		cmin(f[o][3],f[c1][1]+f[c2][2]);

		cmin(f[o][3],f[c1][2]+f[c2][1]);

		cmin(f[o][0],f[c1][0]+f[c2][2]);

		cmin(f[o][0],f[c1][2]+f[c2][0]);

		cmin(f[o][0],f[c1][2]+f[c2][3]);

		cmin(f[o][0],f[c1][3]+f[c2][2]);

		return;

	}

	for(register int p=e[o].next;p;p=e[p].next)

		if(e[p].to!=fa)

		{

			dfs(e[p].to,o);

			int mn=0x3f3f3f3f;

			for(register int i=0;i<=3;++i)if(i!=2)cmin(mn,f[e[p].to][i]);

			g[1]+=mn;

			cmin(g[1],g[0]+f[e[p].to][2]);

			g[0]+=mn;

		}

	f[o][3]=g[1];

	f[o][1]=g[0];

}

int main()

{

	int n=io::F();

	if(n==2){puts("1");return 0;}

	for(register int i=1;i<n;++i)

	{

		int x=io::F(),y=io::F();

		insert(x,y);

		insert(y,x);

	}

	memset(f,63,sizeof(f));

	for(register int i=0;i<n;++i)

		if(deg[i]!=1){dfs(i,i);printf("%d\n",dmin(f[i][1],f[i][3]));break;}

	return 0;

}




// Faster C++ solution for the same problem (measured speedup: 1.366484122143427x):
#include<cstdio>

#include<cstring>

#include<algorithm>

#include<cmath>

#include<ctime>

#include<cstdlib>

#define cmax(a,b) (a<(b)?a=(b),1:0)

#define cmin(a,b) (a>(b)?a=(b),1:0)

#define dmin(a,b) ((a)<(b)?(a):(b))

#define dmax(a,b) ((a)>(b)?(a):(b))

#define CL fclose(stdin),fclose(stdout)

namespace io

{

	int F()

	{

		int n=0,F=1;

		char ch;

		while((ch=getchar())!='-'&&(ch<'0'||ch>'9'));

		ch=='-'?F=0:n=ch-'0';

		while((ch=getchar())>='0'&&ch<='9')n=(n<<1)+(n<<3)+ch-'0';

		return F?n:-n;

	}

	long long G()

	{

		long long n=0,F=1;

		char ch;

		while((ch=getchar())!='-'&&(ch<'0'||ch>'9'));

		ch=='-'?F=0:n=ch-'0';

		while((ch=getchar())>='0'&&ch<='9')n=(n<<1)+(n<<3)+ch-'0';

		return F?n:-n;

	}

}

struct edge

{

	int to;

	int next;

}e[333333];

int pe=111111;

int deg[111111];

void insert(int a,int to)

{

	e[pe]=(edge){to,e[a].next};

	e[a].next=pe++;

	deg[to]++;

}

int f[111111],g[111111];

void dfs(int o,int fa)

{

	if(deg[o]==1){g[o]=1;return;}

	for(register int p=e[o].next;p;p=e[p].next)

		if(e[p].to!=fa)

		{

			dfs(e[p].to,o);

			if(g[e[p].to])++g[o];

				else f[o]+=f[e[p].to];

		}

	if(g[o]>1)f[o]+=g[o]-1,g[o]=0;

		else if(g[o]==1&&deg[o]-(o!=fa)!=1)g[o]=0;

}

int main()

{

	int n=io::F();

	for(register int i=1;i<n;++i)

	{

		int x=io::F(),y=io::F();

		insert(x,y);

		insert(y,x);

	}

	for(register int i=0;i<n;++i)

		if(deg[i]>2){dfs(i,i);printf("%d\n",f[i]);return 0;}

	puts("1");

	return 0;

}