整活

#include<cstdio>
int main(void){
int nothing,c = 0,c4 = 0;
for(int i = 0;i<8;i++){
scanf("%d",&nothing);
if(nothing){
c4++;
}else c++;
}
printf("%d",(c-c4)/4>= 0?(c-c4)/4:(c4-c)/4);
return 0;
}