import math
import sys
from operator import itemgetter
input = sys.stdin.readline

# a = int(input().rstrip())
# a, b = map(int, input().rstrip().split())
# D = list(map(int, input().rstrip().split()))
# H = [int(input().rstrip()) for _ in range(L)]
# DD = [[0 for j in range(100)] for i in range(200)]
# dict = {} ## dictionary

# if __name__ == '__main__':

N = int(input().rstrip())
dict = {} ## dictionary
ans = 0

for i in range(N):
	a, b, c = map(int, input().rstrip().split())
	if (a == 0):
		if (dict.get(b)):
			dict[b] += c
		else:
			dict[b] = c
	else:
		for j in dict:
			if (b <= j <= c):
				ans += dict[j]
print(ans)