#include<stdio.h> int main() { int n; int num[10000]={0}; num[0] = 0; num[1] = 0; num[2] = 0; num[3] = 1; num[4] = 2; int x = 2; for(int i = 5; i < 10000; i++) { num[i] = num[i-1] + x; if(i % 2 == 0) x++; } while(scanf("%d", &n) != EOF) printf("%d\n", num[n]); return 0; } |
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