S = '0' + input()
N = len(S)
cnts = {}

l = 0
cnt = 1
for i in range(N - 1):
    if S[i] != S[i + 1]:
        cnts[l] = cnt
        cnt = 1
        l += 1
    else:
        cnt += 1
cnts[l] = cnt

ans = 0
for i in range(l):
    if i % 2 == 0:
        continue
    if cnts[i] >= 2:
        ans += (cnts[i] // 2) * cnts[i + 1]
        if i + 2 < l:
            cnts[i + 2] += (cnts[i] // 2) * 2

print(ans)