#include <math.h>
#include <stdio.h>
int main()
{
const double y = 109.3;
const double p = -0.0346;
float x, lm;
scanf("%f", &x);
lm = (p/(x-log(y)))*log10(sqrt(exp(x-y)));
printf("LM = %f", lm );
return 0;
}
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