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#include
int main (int argc, const char * argv[]) { int n; scanf("%d", &n); double result = 0.5; int brojac = 1; for(int i = 3; i <= n; i += 2) { if(brojac % 2 == 0) { result /= ( (double)i / (double)(i + 1) ); } else { result *= ( (double)i / (double)(i + 1) ); } brojac++; } printf("%lf\n", result); return 0; }
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