Go: package main

/*
連鎖行列積
*/

import (
	"bufio"
	"bytes"
	"fmt"
	"log"
	"math"
	"os"
	"strconv"
	"strings"
)

func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}

type mem *[][]int

func main() {
	scanner := makeScanner(1024)
	n := eGetInt(scanner)
	p := make([]int, n+1)
	for i := 0; i < n; i++ {
		rowcol := eGetInts(scanner)
		p[i] = rowcol[0]
		p[i+1] = rowcol[1]
	}
	m := make([][]int, n)
	for i := 0; i < n; i++ {
		m[i] = make([]int, n)
	}
	// 初期値の格納
	for i := 0; i < n; i++ {
		for j := i; j < n; j++ {
			if i == j {
				m[i][j] = 0 //  同じ行列へのコストは当然0
			} else {
				m[i][j] = math.MaxInt64
			}
		}
	}

	// num : 行列の数. num == 1の場合は初期値0を格納ずみ
	for num := 2; num <= n; num++ {
		// s : スタート行列番号
		for s := 0; s+num <= n; s++ {
			// t : 終了行列番号
			t := s + num - 1
			// k : 仕切
			for k := s; k < t; k++ {
				m[s][t] = min(m[s][t], m[s][k]+m[k+1][t]+p[s]*p[k+1]*p[t+1])
			}
		}
	}
	fmt.Println(m[0][n-1])
}

////////////////////////////////////////////////////////////////////////////////
// ライブラリ
////////////////////////////////////////////////////////////////////////////////
func makeScanner(maxByte int) *bufio.Scanner {
	scanner := bufio.NewScanner(os.Stdin)
	scanner.Buffer(make([]uint8, 0, 8192), maxByte)
	return scanner
}
func makeWordScanner() *bufio.Scanner {
	scanner := makeScanner(8192)
	scanner.Split(bufio.ScanWords)
	return scanner
}
func eGetLine(r *bufio.Scanner) string {
	if r.Scan() {
		return r.Text()
	}
	err := r.Err()
	if err != nil {
		log.Fatal(err)
	}
	// EOF
	return ""
}
func eGetInt(r *bufio.Scanner) int {
	line := eGetLine(r)
	return eAtoi(line)
}
func eGetFields(r *bufio.Scanner) []string {
	line := eGetLine(r)
	return strings.Fields(line)
}
func eGetInts(r *bufio.Scanner) []int {
	fields := eGetFields(r)
	ints := make([]int, len(fields))
	for i := 0; i < len(ints); i++ {
		ints[i] = eAtoi(fields[i])
	}
	return ints
}
func eGetChars(r *bufio.Scanner) []string {
	line := eGetLine(r)
	return strings.Split(line, "")
}
func eAtoi(s string) int {
	n, err := strconv.Atoi(s)
	if err != nil {
		log.Fatal(err)
	}
	return n
}

type ints []int

func (s ints) String() string {
	var buf bytes.Buffer
	buf.WriteString("[")
	sep := ""
	for _, v := range s {
		buf.WriteString(fmt.Sprintf("%s%d", sep, v))
		sep = ", "
	}
	buf.WriteString("]")
	return buf.String()
}

func reverse(a ints) ints {
	r := make(ints, len(a))
	for i := 0; i < len(a); i++ {
		r[i] = a[len(a)-1-i]
	}
	return r
}
func max(a ints) (int, bool) {
	if len(a) == 0 {
		return 0, false
	}
	m := a[0]
	for _, e := range a {
		if e > m {
			m = e
		}
	}
	return m, true
}

// func min(a []int) int {
// 	m := a[0]
// 	for _, v := range a {
// 		if v < m {
// 			m = v
// 		}
// 	}
// 	return m
// }

func sum(a ints) int {
	if len(a) == 0 {
		return 0
	}
	sum := 0
	for _, e := range a {
		sum += e
	}
	return sum
}
func find(n int, a ints) int {
	for i, v := range a {
		if n == v {
			return i
		}
	}
	return -1
}

C++: #include <bits/stdc++.h>
using namespace std;
struct cww{cww(){ios::sync_with_stdio(false);cin.tie(0);}}star;
#define P(x) cout << (x) << endl
#define p(x) cout << (x)
#define all(c) (c).begin(), (c).end()
#define rall(c) (c).rbegin(), (c).rend()
#define vv(type, c, m, n, i) vector<vector<type>> c(m, vector<type>(n, i));
#define rep(i,a,n) for(int i=(a), i##_len=(n); i<i##_len; ++i)
#define rrep(i,a,n) for(int i=(a), i##_len=(n); i>i##_len; --i)
#define len(x) ((int)(x).size())
#define mp make_pair
#define eb emplace_back
typedef long long ll;
typedef vector<int> vi;
typedef vector<double> vd;
typedef vector<long long> vll;
typedef vector<string> vs;
typedef vector<bool> vb;
constexpr int MAX = 101;
int main() {
	int n; cin >> n;
	vi z(MAX);
	vv(int, m, MAX, MAX, 0);
	rep(i, 1, n + 1) {
		cin >> z[i - 1] >> z[i];
	}
	int j;
	rep(l, 2, n + 1) {
		rep(i, 1, n - l + 2) {
			j = i + l - 1;
			m[i][j] = 1e8;
			rep(k, i, j) {
				m[i][j] = min(m[i][j], m[i][k] + m[k + 1][j] + z[i - 1] * z[k] * z[j]);
			}
		}
	}
	P(m[1][n]);
	return 0;
}

C++: #include <iostream>
#include <algorithm>
using namespace std;

static const int N = 100;

int main()
{
    int n, p[N + 1], m[N + 1][N + 1];
    cin >> n;
    for (int i = 1; i <= n; i++){
        cin >> p[i - 1] >> p[i];
    }

    for (int i = 1; i <= n; i++){
        m[i][i] = 0;

    }

    for (int l = 2; l <= n; ++l)
    {
        for (int i = 1; i <= n - l + 1; i++){
            int j = i + l - 1;
            m[i][j] = (1 << 30);
            for (int k = i; k <= j - 1; k++)
            {
                m[i][j] = min(m[i][j], m[i][k] + m[k + 1][j] + p[i - 1] * p[k] * p[j]);
            }
        }
    }

    cout << m[1][n] << endl;
    return 0;
}

C++: #include <climits>
#include <iomanip>
#include <iostream>
#include <utility>
#include <vector>

using namespace std;

int main() {
    int n;
    cin >> n;
    vector<pair<int, int>> m(n);
    for (int i = 0; i < n; ++i) {
        int a, b;
        cin >> a >> b;
        m[i] = make_pair(a, b);
    }

    vector<vector<int>> v(n, vector<int>(n, INT_MAX));
    for (int i = 0; i < n; ++i)
        v[i][i] = 0;

    for (int width = 2; width <= n; ++width) {
        for (int i = 0; i < n - width + 1; ++i) {
            int j = i + width - 1;
            for (int k = i; k < j; ++k) {
                v[i][j] =
                    min(v[i][j], v[i][k] + v[k + 1][j] +
                                     m[i].first * m[k].second * m[j].second);
            }
        }
    }
    cout << v[0][n - 1] << '\n';
}

C++: #include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define FOR(i,a,b) for(ll i=a;i<=b;i++)
#define FORD(i,a,b) for(int i=a;i>=b;i--)
#define ALL(a)  (a).begin(),(a).end()
#define SZ(a) int((a).size())
#define SORT(c) sort((c).begin(),(c).end())
#define MEMSET(v, h) memset((v), h, sizeof(v))
#define sqr(x) ((x) * (x))
#define bit(n) (1LL<<(n))
#define pcnt(x) __builtin_popcountll(x)
#define PB push_back
#define MP make_pair
#define endl "\n"
using Edge = pair<int,int>;
using Graph = vector<vector<Edge>>;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
// ll gcd(ll a,ll b){return b?gcd(b,a%b):a;}
// ll lcm(ll a,ll b){return a/gcd(a,b)*b;}

ll dp[110][110];
const ll MAX = 1001001001001001;

int main() {
  int n; cin >> n;
  ll p[n+1];
  FOR(i,0,n-1){
    cin >> p[i] >> p[i+1];
  }
  FOR(i,1,n){
    FOR(j,1,n){
      if(i==j) continue;
      else dp[i][j] = MAX;
    }
  }
  
  FOR(l,2,n){
    FOR(i,1,n-l+1){ //連鎖長がlのものでループ
      int j = i+l-1;
      FOR(k,i,j-1){
        ll q = dp[i][k] + dp[k+1][j] + p[i-1]*p[k]*p[j];
        chmin(dp[i][j],q);
      }
    }
  }
  cout << dp[1][n] << "\n";

}

C++: // -*- mode:c++; coding:utf-8; c-basic-offset:2; -*-
// ALDS1_10_B: Matrix Chain Multiplication

#include <algorithm>
#include <climits>
#include <cstdio>

using uint = unsigned int;

static uint matrix_chain_multiplication(const uint p[], const uint n)
{
  uint m[n][n];
  for (auto i = 0u; i < n; ++i) m[i][i] = 0u;

  for (auto d = 1u; d < n; ++d) {
    for (auto i = 0u, j = i+d; j < n; ++i, ++j) {
      auto min = UINT_MAX;
      for (auto k = i; k < j; ++k) {
        // min(Mi..j = (Mi..k) * (Mk+1..j)
        //           = (Mi..k) + (Mk+1..j) + p[i]*p[k+1]*p[j+1])
        auto cost = m[i][k] + m[k+1][j] + p[i]*p[k+1]*p[j+1];
        min = std::min(min, cost);
      }
      m[i][j] = min;
    }
  }
  return m[0][n-1];
}

int main()
{
  uint n;
  std::scanf("%u", &n);
  uint p[n+1];
  for (auto i = 0u; i < n; ++i) {
    std::scanf("%u %u", &p[i], &p[i+1]);
  }
  auto c = matrix_chain_multiplication(p, n);
  std::printf("%u\n", c);
}

// eof