#include<stdio.h> #include<math.h> int main() { int a,b,c; while(scanf("%d %d %d",&a,&b,&c)!=EOF) { double p,s; p=(double)(a+b+c)/2; s=sqrt(p*(p-a)*(p-b)*(p-c)); printf("%.2lf\n",s); } }
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