39-2

#include<stdio.h>
int main(void)
{
    double x,y;
    printf("Enetr x:");
    scanf("%lf",&x);
    
    if(0<=x<=50){
        y=x*0.53;
    }
    if(x>50){
        y=26.5+(x-50)*0.58;
    }

    printf("y=%lf\n",y);

    return 0;

}