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

#define rd(v) long v=0;{long _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;}
#define wt(v) {long _z=v;do*--wp=_z%10+48;while(_z/=10);}
#define rep(v,e) for(long v=0;v<e;++v)
#define rep3(v,s,e) for(long v=s;v<e;++v)
#define MD 998244353

int r[200000];

long f0(){
	char*mmap();
	char*rp=mmap(0l,1l<<25,1,2,0,0ll);
	rd(n);
	rep(i,n){
		rd(p);
		r[p]=i;
	}
	return n;
}

long f1(long n){
	long mn=r[0];
	long mx=r[0];
	long z=1;
	rep3(i,1,n){
		long ri=r[i];
		if(mn>ri){
			mn=ri;
		}else if(mx<ri){
			mx=ri;
		}else{
			z=z*(mx-mn-i+1)%MD;
		}
	}
	return z;
}

void f2(long z){
	char wbuf[64],*wp=wbuf+sizeof wbuf;
	wt(z);
	write(1,wp,wbuf+sizeof wbuf-wp);
	_exit(0);
}

main(){
	f2(f1(f0()));
}