#include <cstdio>
#include <cstring>
#include <vector>
using namespace std;
int main()
{
	int n, q;
	int ZanCun[5];
	vector<vector<int> > Cab;
	scanf("%d %d", &n, &q);
	#if 0
	printf("\n%d %d\n", n, q);
	#endif
	for(int i = 1; i <= q; i++)
	{
		memset(ZanCun, 0, 5);
		int a;
		scanf("%d", &a);
		if(a == 1)
		{
			for(int j = 1; j <= 3; j++)
				scanf("%d", &ZanCun[j]);
			if(ZanCun[3] != 0)
				Cab[ZanCun[1]][ZanCun[2]] += ZanCun[3];
			else
				Cab[ZanCun[1]][ZanCun[2]] = 0;
		}
		else if(a == 2)
		{
			for(int j = 1; j <= 2; j++)
				scanf("%d", &ZanCun[j]);
			printf("%d\n", Cab[ZanCun[1]][ZanCun[2]]);
		}
	}
	
	return 0;
}