#include<iostream>
#include<cassert>
#include<atcoder/lazysegtree>
using namespace std;
long op(long a,long b){return min(a,b);}
long e(){return(long)1e18;}
long mp(long f,long x){return f+x;}
long id(){return 0L;}
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int Q,L;
	cin>>Q>>L;
	atcoder::lazy_segtree<long,op,e,long,mp,mp,id>seg(vector<long>(L,0));
	for(;Q--;)
	{
		int t,l,r,c;cin>>t>>l>>r>>c;
		if(t==2)c=-c;
		seg.apply(l,r,c);
		cout<<seg.all_prod()<<"\n";
	}
}