//A + B/C + DEF/GHI = 10 凑算式 标记一下1-9个数,再搜索一下就好了
#include <iostream>
using namespace std;
bool visited[10];
int ans[100];
int k = 0;
int coun = 0;
bool judge(){
double x = (double)ans[1]/ans[2];
double y = (double)(ans[3]*100+ans[4]*10+ans[5])/(ans[6]*100+ans[7]*10+ans[8]);
if(ans[0]+x+y == 10)
return 1;
else
return 0;
}
void dfs(int depth){
if(depth >= 9)
{
if(judge())
coun++;
return;
}
for(int i = 1; i < 10; i++)
if(!visited[i])
{
visited[i] = true;
ans[k++] = i;
dfs(depth+1);
visited[i] = false;
k--;
}
}
int main(){
dfs(0);
cout << coun << endl;
return 0;
}