#include <stdio.h>
#include <math.h>

int main(int argc, const char * argv[]) {
    // insert code here...
    double a=0,b=0,c=0;
    double s=0;
    double p=0;
    double ans=0;
    scanf("%lf %lf %lf",&a,&b,&c);
    p=(a+b+c)/2;
    ans=p*(p-a)*(p-b)*(p-
 
c);
    s=sqrt(ans);
    printf("%.1lf",s);
    return 0;
}

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