/*Tju 3207. Sand Castle
http://acm.tju.edu.cn/toj/showp3207.html
排序后貪心，貪心的正確性證明很簡(jiǎn)單，只要匹配出現(xiàn)交叉則浪費(fèi)
*/
#include<stdio.h>
#include<algorithm>
using namespace std;
int na[25001];
int nb[25001];
int cmp(int x , int y){
return x < y;
}
int main(){
int n , h1, h2 ;
scanf("%d%d%d",&n,&h1,&h2);
for(int i = 0 ; i < n ; i++)
scanf("%d%d",&na[i],&nb[i]);
sort(na,na+n,cmp);
sort(nb,nb+n,cmp);
int sum = 0;
for(int i = 0 ; i < n ; i++){
if(na[i] > nb[i]){
sum += h2 * (na[i] - nb[i]);
}
else{
sum += h1 * (nb[i] - na[i]);
}
}
printf("%d\n",sum);
return 0;
}
/*
TJU 3209. Look Up
http://acm.tju.edu.cn/toj/showp3209.html
自底而上掃，紀(jì)錄結(jié)果，以紀(jì)錄跳轉(zhuǎn)的方式優(yōu)化時(shí)間
*/
#include<stdio.h>
int a[100001];
int ans[100001];
int now;
int main(){
int n;
scanf("%d",&n);
for(int i = 0 ; i <n ; i++){
scanf("%d",&a[i]);
}
ans[n-1] = -1 ;
for(int i = n - 2 ; i >= 0 ; i--){
if(a[i]<a[i+1]){
ans[i] = i + 1;
}
else{
now = i + 1;
while(1){
if(now == -1 ){
if(a[now] > a[i])
ans[i] = now;
else
ans[i] = -1 ;
break;
}
if(a[now] > a[i] )
{
ans[i] = now;
break;
}
else{
now = ans[now];
}
}
}
}
for(int i = 0 ; i < n ; i++)
printf("%d\n",ans[i]+1);
return 0;
}
/**//*
TJU 3208. Cow Frisbee Team
http://acm.tju.edu.cn/toj/showp3208.html
DP 控制取與不取更新更大的值 dp的兩維分別代表取用前i個(gè)cow 和 余數(shù)大小
*/
#include<stdio.h>
const int MOD=100000000;
int a[2001];
int n , f;
int dp[2001][1001];
int main()
{
scanf("%d%d",&n,&f);
for(int i = 0 ; i < n ; i++){
scanf("%d",&a[i]);
}
dp[0][0] = 1;
for(int i = 0 ; i < n ; i++){
for(int j = 0 ; j < f ; j++){
dp[i+1][j] += dp[i][j] % MOD;
dp[i+1][(j+a[i])%f] += dp[i][j] % MOD;
}
}
printf("%d\n",(dp[n][0]-1)%MOD);
return 0 ;
}