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 <iostream>
#include <cstdio>
#include <cstring>
#include <climits>
#include <string>
#include <algorithm>
#include <cmath>
#include <vector>
#include <stack>
#include <queue>
#include <map>
#include <unordered_map>
#include <set>
#include <unordered_set>
#include <sstream>
#include <numeric>

// namespace
using namespace std;

// int mcm(const vector<int> &p, int i, int j) { // i-th matrix has the size (p[i], p[i+1])
//     if (i == j) return 0;
//     int m = INT_MAX;
//     for (int k = i; k < j; ++k) {
//         m = min(m, mcm(p, i, k) + mcm(p, k + 1, j) + p[i] * p[k + 1] * p[j + 1]);
//     }
//     return m;
// }

// int mcm(const vector<int> &p, int i, int j, vector<vector<int>> &dp) { // i-th matrix has the size (p[i], p[i+1])
//     if (i == j) return 0;
//     if (dp[i][j] < INT_MAX) return dp[i][j];
//     int m = INT_MAX;
//     for (int k = i; k < j; ++k) {
//         m = min(m, mcm(p, i, k, dp) + mcm(p, k + 1, j, dp) + p[i] * p[k + 1] * p[j + 1]);
//     }
//     return dp[i][j] = m;
// }

int mcm(const vector<int> &p) { // i-th matrix has the size (p[i], p[i+1])
    int n = p.size() - 1;
    vector<vector<int>> dp(n, vector<int>(n, INT_MAX));
    for (int i = 0 ; i < n; ++i) dp[i][i] = 0;
    for (int l = 1; l < n; ++l)
        for (int i = 0, j; (j = i + l) < n; ++i)
            for (int k = i; k < j; ++k)
                dp[i][j] = min(dp[i][j], dp[i][k] + dp[k + 1][j] + p[i] * p[k + 1] * p[j + 1]);
    return dp[0][n-1];
}

int main() {
    int n, r, c;
    cin >> n;
    vector<int> p;
    for (int i = 0; i < n; ++i) {
        cin >> r >> c;
        p.push_back(r);
    }
    p.push_back(c);
    auto ans = mcm(p);
    cout << ans << endl;
    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 ( i = 1; i <= n - l + 1; i++ ) {
               int j = i + l - 1;
               m[i][j] = (1 << 21);
               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++: // http://algorithms.blog55.fc2.com/blog-entry-66.html

#include <stdio.h>
#include <string.h>

#define M 100
int R[M+1],C[M][M],B[M][M];
void D(int i,int j){
	if(i==j)printf("M%d",i);
	else printf("("),D(i,B[i][j]-1),D(B[i][j],j),printf(")");
}

main(){
	int N,i=0,j,k,c;
	scanf("%d",&N);
	for(;i<N;i++)scanf("%d%d",R+i,&c);
	R[i]=c;
	memset(C,99,sizeof(C));
	for(i=0;i<N;i++)C[i][i]=0;
	for(j=1;j<N;j++)for(i=0;i<N-j;i++)for(k=i;k<i+j;k++)
		if((c=C[i][k]+C[k+1][i+j]+R[i]*R[k+1]*R[i+j+1])<C[i][i+j])C[i][i+j]=c,B[i][i+j]=k;
	printf("%d\n",C[0][N-1]);
	//order(0,N);
	//puts("");
}

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

static const int N = 100;

int main(){
    int n,a[N + 1],b[N + 1][N + 1],k;
    cin >> n;
    for(int i = 1;i <= n;i++){
        cin >> a[i - 1] >> a[i];
    }
    for(int i = 1;i <= n;i++){
        b[i][i] = 0;
    }
    for(int i = 2;i <= n;i++){
        for(int j = 1;j <= n - i + 1;j++){
            k = j + i - 1;
            b[j][k] = (1 << 21);
            for(int l = j;l <= k - 1;l++){
                b[j][k] = min(b[j][k],b[j][l] + b[l + 1][k] + a[j - 1]*a[l]*a[k]);
            }
        }
    }
    cout << b[1][n] << endl;
    return 0;
}

C++: #include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<cmath>

#define FOR(i,a,b) for(int i=(a);i<(b);++(i))
#define REP(i,n) FOR(i,0,n)

#define dump(x) cerr << #x << " = " <<(x)<<endl;
#define debug(x) cerr << #x << " = " <<(x) << "(L" << __LINE__ << ")" << __FILE__ << endl;

using namespace std;

int main(void){
  int n,i;
  cin >> n;
  vector<int> input(n+1);
  REP(i,n) cin >> input[i] >> input[i+1];
  
  vector<vector<int>> res(n+1, vector<int>(n+1));
  vector<int> p(n+1);
  FOR(i,1,n+1) res[i][i]=0;
  FOR(l,2,n+1){
    FOR(i,1,n-l+2){
      int j = i+l-1;
      res[i][j] = (1<<21);
      FOR(k,i,j){
        res[i][j] = min(res[i][j],res[i][k]+res[k+1][j] + input[i-1]*input[k]*input[j]);

        
      }
    }
  }
  /*
  REP(i,n+1){
    REP(j,n+1){
      cout << res[i][j] << " ";
    }
    cout << endl;
  }
  */
  cout << res[1][n] << endl;


  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=0;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<<21);
      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;
}