def main(): import sys input = sys.stdin.read().split() idx = 0 N = int(input[idx]) idx += 1 items = [] for i in range(1, N+1): c_i = int(input[idx]) v_i = int(input[idx+1]) idx += 2 items.append((i, c_i, v_i)) INF = -1 << 60 dp = [[INF] * (N + 1) for _ in range(N + 1)] dp[0][0] = 0 # Process first item (i=1, weight=1) i, c_i, v_i = items[0] assert i == 1 for t in range(0, c_i + 1): for k in range(N, t - 1, -1): for w in range(N, t * i - 1, -1): if dp[k - t][w - t * i] != INF: if dp[k][w] < dp[k - t][w - t * i] + t * v_i: dp[k][w] = dp[k - t][w - t * i] + t * v_i # Process other items for i, c_i, v_i in items[1:]: for t in range(0, c_i + 1): for k in range(N, t - 1, -1): for w in range(N, t * i - 1, -1): if dp[k - t][w - t * i] != INF: if dp[k][w] < dp[k - t][w - t * i] + t * v_i: dp[k][w] = dp[k - t][w - t * i] + t * v_i for k in range(1, N + 1): max_val = INF for w in range(k, N + 1): if dp[k][w] > max_val: max_val = dp[k][w] print(max_val) if __name__ == "__main__": main()