from math import *
n = int(input())
a = list(map(int, input().split()))
ln = int(sqrt(n) + 1)
b = [0 for i in range(ln + 100)]
for i in range(n):
    b[i // ln] += a[i]
seq = []
for l in range(n):
    for r in range(n):
        if r < l:
            continue
        sm = 0
        i = l
        while i <= r:
            if i % ln == 0 and i + ln - 1 <= r:
                sm += b[i // ln]
                i += ln
            else:
                sm += a[i]
                i += 1
        seq.append((l, r, sm))

d = dict()
for i in seq:
    d[i[2]] = []

for i in seq:
    if d[i[2]] == []:
        d[i[2]].append((i[0] + 1, i[1] + 1))
        continue
    if i[0] + 1 > d[i[2]][-1][1]:
        d[i[2]].append((i[0] + 1, i[1] + 1))

ans = []
for i in d.keys():
    if len(d[i]) > len(ans):
        ans = d[i]
print(len(ans))
for i in ans:
    print(i[0], i[1])