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- #include <stdio.h>
- long long int factoril(int n){
- long long int ans=1;
- for(int i=1; i<=n; i++){
- ans*=i;
- }
- return ans;
- }
- int main(){
- int n, cnt=0;
- while(scanf("%d",&n)==1){
- if(n>0)cnt++;
- }
- long long int hor = factoril(cnt);
- long long int lov = factoril(cnt-2);
- printf("%d\n", hor/(2*lov));
- return 0;
- }
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