import { start } from "repl";

export {};
const input = require("fs").readFileSync(0).toString().trim().split("\n");

const N: number = Number(input[0]);
let rc: number[][] = []
for(let i=1; i<=N; i++) rc.push(input[i].split(" ").map(Number));

let dp: number[][] = Array.from({length : N}, () => new Array(N).fill(0));

for(let len=2; len<=N; len++) {
    for(let start=0; start<=N-len; start++) {
        const end: number = start + len - 1;
        dp[start][end] = Number.MAX_VALUE;


        for(let k=start; k<end; k++) {
            const leftOp: number = dp[start][k];
            const rightOp: number = dp[k+1][end];
            const mergeOp: number = rc[start][0]*rc[k][1]*rc[end][1];

            dp[start][end] = Math.min(dp[start][end], leftOp + rightOp + mergeOp);
        }
    }
}

console.log(dp[0][N-1]);