// yukicoder: No.464 PPAP // bal4u 2019.8.15 #include typedef long long ll; //// 入出力関係 #if 0 #define gc() getchar_unlocked() #else #define gc() getchar() #endif int spa; int ins(char *s) { // 文字列の特殊入力 char *p = s; int c; *s++ = '_', spa = c = gc(), *s++ = c, *s++ = '_'; while (1) { if ((c = gc()) <= ' ') break; *s++ = c, *s++ = '_'; if (spa > 0 && c != spa) spa = -1; } *s = 0; return s - p; } //// 回文の最長半径を求める void manacher(int *rad, char *s, int n) { int l, r, c = 0; for (r = 0; r < n; r++) { l = (c << 1) - r; // l = c - (r - c); if (r + rad[l] < c + rad[c]) rad[r] = rad[l]; else { int rr = c + rad[c]; int rl = (r << 1) - rr; while (rl >= 0 && rr < n && s[rl] == s[rr]) rr++, rl--; rad[r] = rr - r; c = r; } } } #define MAX 10010 char S[MAX]; int W; int rad[MAX]; int pp1[MAX], wp1; int pp3[MAX], wp3; // 見つからなければ、一つ小さい要素を返す int bsLE(int l, int x) { int m, r = wp1; while (l < r) { m = (l+r) >> 1; if (pp1[m] <= x) l = m + 1; else r = m; } return l-1; } // 見つからなければ、一つ大きい要素を返す。つまり、 >= x int bsGE(int *pp, int x, int r) { int m, l = 0; while (l < r) { m = (l+r) >> 1; if (pp[m] < x) l = m + 1; else r = m; } return l; } int main() { int i, cp1, cp3, w1, w3; ll ans; W = ins(S); if (spa > 0) { // 同じ文字の列 W >>= 1; printf("%lld\n", (ll)(W-3)*(W-2)*(W-1)/6); return 0; } // printf("W:%d, %s\n", W, S); manacher(rad, S, W); // 回文であるP1, P3 w1 = W-7, cp1 = 1; w3 = 7, cp3 = W >> 1; for (i = 1; i < W; i+=2) { if (i < w1 && i < cp1 + rad[cp1]) pp1[wp1++] = i; if (i >= w3 && i > cp3 - rad[cp3]) pp3[wp3++] = i; cp1++, cp3++; } ans = 0; w1 = W-5, w3 = W-4; for (i = 3; i < w1; i++) { int j, l, r; if (i-rad[i] <= 1) l = 0; else l = bsGE(pp1, i-rad[i], wp1); r = bsLE(l, i-2+(i&1)); for (j = l; j <= r; j++) { int w = (i<<1) - pp1[j]; if (w > w3); else if (w >= pp3[0]) ans += wp3 - bsGE(pp3, w+2, wp3); else { ans += (ll)(r-j+1) * wp3; break; } } } printf("%lld\n", ans); return 0; }