include<stdio.h>

int main() {

freopen("score.in","r",stdin);
freopen("score.out","w",stdout);
double a,b,c,d;
scanf("%lf%lf%lf",&a,&b,&c);
d=a*0.2+b*0.3+c*0.5;
int e=d;
printf("%d",e);
return 0;

}