int perfect(int x){ int y1, y2, y3; if(x <= 1) return 0; y1=x; y2=x; y3=x; for(y1 = x-1; y1>0;y1=y1-1){ while(y2 >= y1) y2 = y2 - y1; if(y2 == 0) y3 = y3 - y1; y2 = x; } return (y3 == 0); }