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#include<stdio.h>
#include<math.h>
void main()
{
    float x,y,z;
    scanf("%f",&x);
    z=x%4;
    if(z=>0&&z<1)
        y=6z;
    else if(z=>1&&z<3)
        y=-6z+12;
    else if(z=>3&&z<4)
        y=6z-24;
    else
        y=0;
   printf("%f",y);
}
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