public static void main(String[] args) {

int c0=0, c1=0, c2=0;

for(int x=1; x<=20; x++) {

switch(x%3) {

case 0: c0++; break;

case 1: c1++; break;

case 2: c2++; break;

}

}

System.out.println("c0,c1,c2="+c0+","+c1+","+c2);

}
c0,c1,c2=6,7,7
c0,c1,c2=7,6,6