40分，求助大神看一看

#include <stdio.h>

int main( )
{
    int m,t,s;
    scanf("%d %d %d",&m,&t,&s);
    double number=1.0*s/t;
    int mount=1,i;
    for (i=1;i<number;i++){
        mount++;
    }
    printf("%d",m-mount);
    
    return 0;
}