#include <stdio.h>
#include <limits.h>

#define MAX INT_MAX

int size[501][2];
int dp[501][501];

int min(int a, int b) { return a>b ? b : a; }

int main() {
    int N;
    scanf("%d",&N);

    for(int i=1; i<=N; i++) scanf("%d %d",&size[i][0], &size[i][1]);

    for(int len=1; len<N; len++) {
        for(int i=1; i<=N-len; i++) {
            int j = i + len;
            dp[i][j] = MAX;

            for(int k=i; k<j; k++) {
                int left_times = dp[i][k];
                int right_times = dp[k+1][j];
                int operator_count = size[i][0] * size[k][1] * size[j][1];
                dp[i][j] = min(dp[i][j], left_times + right_times + operator_count);
            }
        }
    }

    printf("%d\n",dp[1][N]);

    return 0;
}