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