#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;})

char t[500004];

long f(char*s){
	while(*s){
		char*u=t;
		while(*(long*)s==*(long*)u){
			s+=sizeof(long);
			u+=sizeof(long);
		}
		while(*s==*u){
			++s;
			++u;
		}
		++u;
		while(*(long*)s==*(long*)u){
			s+=sizeof(long);
			u+=sizeof(long);
		}
		while(*s==*u){
			++s;
			++u;
		}
		if(*s++!=10){
			return 0;
		}
	}
	return 1;
}

int main(){
	char*mmap();
	char*rp=mmap(0l,1l<<25,1,2,0,0ll);
	rd_skip();
	long m=rd();
	long j=0;
	char*s1=rp;
	char*s2=rp+(m+1);
	long v;
	while(v=*(long*)(s1+j),v==*(long*)(s2+j)){
		*(long*)(t+j)=v;
		j+=sizeof(long);
	}
	while(s1[j]==s2[j]){
		t[j]=s1[j];
		++j;
	}
	long r=48;
	t[j]=s1[j];
	memcpy(t+(j+1),s2+j,m-j);
	r+=f(rp);
	t[j]=s2[j];
	memcpy(t+(j+1),s1+j,m-j);
	r+=f(rp);
	write(1,&r,1);
	_exit(0);
}