N = int(input())
matrix_size = [[0,0]] + [list(map(int, input().split())) for _ in range(N)]

INF = float("inf")
dp = [[INF]*(N+1) for _ in range(N+1)]
for i in range(1,N+1) :
    dp[i][i] = 0

for l in range(2,N+1) :
    for left in range(1,N) :
        right = left + l - 1
        if right > N :
            continue
        
        if l == 2 :
            dp[left][right] = matrix_size[left][0]*matrix_size[left][1]*matrix_size[right][1]
        
        else :
            for k in range(left+1, right) :
                temp = dp[left][k] + dp[k+1][right] + matrix_size[left][0]*matrix_size[k][1]*matrix_size[right][1]
                dp[left][right] = min(dp[left][right], temp)

print(dp[1][N])