include <stdio.h>
int main() {
double c; int a; scanf("%d",&a);
if(a<=150) {
c=a*0.4463;
} else if(a>150&&a<=400) {
c=150*0.4463+(a-150)*0.4663;
} else {
c=150*0.4463+(400-150)*0.4663+(a-400)*0.5663;
} printf("%.1lf",c); return 0; }
int main() {
double c; int a; scanf("%d",&a);
if(a<=150) {
c=a*0.4463;
} else if(a>150&&a<=400) {
c=150*0.4463+(a-150)*0.4663;
} else {
c=150*0.4463+(400-150)*0.4663+(a-400)*0.5663;
} printf("%.1lf",c); return 0; }
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