def main(): import sys input = sys.stdin.read().split() ptr = 0 N = int(input[ptr]) ptr += 1 items = [] for i in range(N): c_i = int(input[ptr]) v_i = int(input[ptr + 1]) ptr += 2 items.append((c_i, v_i)) INF = -10**18 dp = [[INF] * (N + 1) for _ in range(N + 1)] dp[0][0] = 0 for i in range(N): weight = i + 1 c_i, v_i = items[i] for k in reversed(range(N + 1)): for w in reversed(range(N + 1)): if dp[k][w] == INF: continue max_t = min(c_i, (N - k), (N - w) // weight) if max_t <= 0: continue for t in range(1, max_t + 1): new_k = k + t new_w = w + t * weight if new_k > N or new_w > N: break if dp[new_k][new_w] < dp[k][w] + t * v_i: dp[new_k][new_w] = dp[k][w] + t * v_i for k in range(1, N + 1): max_val = max(dp[k][k:N+1]) print(max_val) if __name__ == "__main__": main()