n = int(input())
q = []
g = 0
for i in range(n):
    b = list(map(int ,input().split()))
    q.append(b)
    g = max(g,b[2])
a = [0] * g
ans = 0
for i in q:
    if i[0] == 0:
        a[i[1]] += i[2]
    if i[0] == 1:
        ans += sum(a[i[1]:i[2]+1])
print(ans)