#include<bits/stdc++.h>
using namespace std;

int n,cnt=0;
struct point{
    int x,y;
}p[200010],v[200010],q[200010];

bool cmp(point x,point y){
    if (x.x!=y.x) return x.x<y.x;
    return x.y<y.y;
}

bool check(point x,point y,point z){
    int a,b,c,d;
    a=y.x-x.x;
    b=y.y-x.y;
    c=z.x-x.x;
    d=z.y-x.y;
    if (a*d-b*c>0) return 1;
    return 0;
}

void tb(){
    v[++cnt]=p[1];
    v[++cnt]=p[2];
    for (int i=3;i<=n;i++){
        while(!check(v[cnt-1],v[cnt],p[i]) && cnt>1){
            cnt--;
        }
        v[++cnt]=p[i];
    }
    int temp=cnt;
    v[++cnt]=p[n-1];
    for (int i=n-2;i>=1;i--){
        while(!check(v[cnt-1],v[cnt],p[i]) && cnt>temp){
            cnt--;
        }
        v[++cnt]=p[i];
    }
    cnt--; 
}

int main(){
    scanf("%d",&n);
    for (int i=1;i<=n;i++){
        int x,y;
        scanf("%d %d",&p[i].x,&p[i].y);
        q[i]=p[i];
    }
    //sort(p+1,p+1+n,cmp);
    tb();
    int pp=1;
    if (cnt!=n) pp=0;
//    else {
//	    int p1=1,p2=1;
//    	int i=1,j;
//	    for (i=1;i<=n;i++) if (q[1].x==v[i].x && q[1].y==v[i].y) break;
//	    j=1;
//	    while(j<=n){
//	    	if (v[i].x!=q[j].x || v[i].y!=q[j].y){
//	    		p1=0;
//	    		break;
//			}
//	    	i=i%n+1;
//			j=j+1;
//		}
//		for (i=1;i<=n;i++) if (q[1].x==v[i].x && q[1].y==v[i].y) break;
//		j=1;
//		while(j<=n){
//			if (v[i].x!=q[j].x || v[i].y!=q[j].y){
//	    		p2=0;
//	    		break;
//			}
//	    	i=i-1;
//	    	if (i<=0) i+=n; 
//			j=j+1;
//		}
//		pp=p1|p2;
	}
    if (pp) printf("Yes\n");
    else printf("No\n");
}

answer.code:81:5: error: expected unqualified-id before ‘if’
   81 |     if (pp) printf("Yes\n");
      |     ^~
answer.code:82:5: error: expected unqualified-id before ‘else’
   82 |     else printf("No\n");
      |     ^~~~
answer.code:83:1: error: expected declaration before ‘}’ token
   83 | }
      | ^
answer.code: In function ‘int main()’:
answer.code:45:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   45 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
answer.code:48:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   48 |         scanf("%d %d",&p[i].x,&p[i].y);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~