#include<cstdio> #include<unordered_set> const int N=1e5+1;int a[N]; int main(){int n,m;scanf("%d%d",&n,&m);for(int i=1;i<=n;i++)scanf("%d",a+i); for(int o,l,r,x;m--&&scanf("%d%d%d",&o,&l,&r);)if(o==1){scanf("%d",&x);for(int i=l;i<=r;i++)a[i]=x;} else{std::unordered_set<int>s;for(int i=l;i<=r;i++)s.insert(a[i]);printf("%lu\n",s.size());}}