#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

char*mmap();
#define RD(v) int v=0;{int _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;}

main(){
	char*rp=mmap(0l,1l<<28,1,2,0,0ll);
	RD(n);
	--n;
	RD(c);
	int b=c,d;
	while(n){
		--n;
		RD(a);
		if(a<b){
			if(a>c){
				write(1,"2",1);
				_exit(0);
			}else{
				d=b;
				b=a;
				goto l1;
			}
		}
		b=a;
	}
	write(1,"0",1);
	_exit(0);

	l1:;
	while(n){
		--n;
		RD(a);
		if(a<b){
			write(1,"2",1);
			_exit(0);
		}
		if(a>c){
			if(a<d){
				write(1,"2",1);
				_exit(0);
			}else{
				b=a;
				goto l2;
			}
		}
		b=a;
	}while(*rp);
	write(1,"1",1);
	_exit(0);

	l2:;
	while(n){
		--n;
		RD(a);
		if(a<b){
			write(1,"2",1);
			_exit(0);
		}
		b=a;
	}
	write(1,"1",1);
	_exit(0);
}