#include<stdio.h> #include<math.h> int main() { int a,b,c; double s,p; while(scanf("%d%d%d",&a,&b,&c)!=EOF) {p=(a+b+c)/2.0; s=sqrt(p*(p-a)*(p-b)*(p-c)); printf("%.2f\n",s); } return 0;}
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