A.(n-2)*180
1 #include<cstdio> 2 #include<cstring> 3 #include<iostream> 4 #include<algorithm> 5 #define rep(i,l,r) for (int i=(l); i<=(r); i++) 6 typedef long long ll; 7 using namespace std; 8 9 int n; 10 11 int main(){ 12 scanf("%d",&n); printf("%d\n",(n-2)*180); 13 return 0; 14 }