#include<stdio.h> #include<math.h> #include<string.h> #include<stdlib.h> int main() { int m; int i; int V,E,a,b; while(scanf("%d",&m)!=EOF) { V=E=m; a=b=0; for(i=0; i<m-1;i++ ) { a+=i*(m-2-i); b+=i*(m-2-i)+1; } V+=a*m/4; E+=b*m/2; printf("%d\n",E-V+1); } system("pause"); return 0; } |
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