# include<iostream> # include<iostream> # include<iostream> using namespace std; int a[601]; bool z(int a,int b){ for(int i=2;i<a;i++){ if(a%i==0&&b%i==0){ return 0; } } return 1; } int main(){ int n,s=0; cin>>n; for(int i=1;i<=n;i++){ cin>>a[i]; } for(int i=1;i<n;i++){ for(int j=1;j<=n;j++){ s++; } } cout<<s-25; return 0; }