N = 20
X = [0] * (2**(N+1)-1)

def add(j, x):
    i = 2**N + j - 1
    while i >= 0:
        X[i] += x
        i = (i-1) // 2

def rangeof(i):
    s = (len(bin(i+1))-3)
    l = ((i+1) - (1<<s)) * (1<<N-s)
    r = l + (1<<N-s)
    return (l, r)

def rangesum(a, b, i=0):
    l, r = rangeof(i)
    if l >= b or r <= a:
        return 0
    if a <= l and r <= b:
        return X[i]
    return rangesum(a, b, 2*i+1) + rangesum(a, b, 2*i+2)


Q = int(input())
s = 0
for _ in range(Q):
    t, a, b = map(int, input().split())
    if t == 0:
        add(a, b)
    else:
        s += rangesum(a, b+1)

print(s)