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

#define rd_skip() while(*rp++>=48)
#define rd() ({long _v=0,_c;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_v;})
#define wt(v) {ulong _z=v;do*--wp=_z%10+48;while(_z/=10);}
#define MD 998244353

typedef unsigned long ulong;

#define HASH_BITS 18
#define HASH_MASK ((1<<HASH_BITS)-1)
int hashbuf[1<<HASH_BITS];

int hash_get(int x){
	int h=x&HASH_MASK;
	while(1){
		if(hashbuf[h]==0){
			return -1;
		}
		if(hashbuf[h]==x){
			return h;
		}
		h=h+1&HASH_MASK;
	}
}

int hash_add(int x){
	int h=x&HASH_MASK;
	while(1){
		if(hashbuf[h]==0){
			hashbuf[h]=x;
			return h;
		}
		if(hashbuf[h]==x){
			return h;
		}
		h=h+1&HASH_MASK;
	}
}

int b[1<<HASH_BITS];

int main(){
	char*mmap();
	char*rp=mmap(0l,1l<<25,1,2,0,0ll);
	rd_skip();
	long z=0;
	while(*rp){
		long a=rd();
		long k=hash_get(a-1);
		long h=hash_add(a);
		if(k>=0){
			long x=b[k];
			z+=x;
			z-=z<MD?0:MD;
			long y=b[h]+x+1;
			b[h]=y-(y<MD?0:MD);
		}
		else{
			b[h]+=1;
		}
	}
	char wbuf[64],*wp=wbuf+sizeof wbuf;
	wt(z);
	write(1,wp,wbuf+sizeof wbuf-wp);
	_exit(0);
}