#include <stdio.h>
#define EUR_PER_USD 0.85
int main() {
    int amount_usd;
    double amount_eur;
    printf("Enter the amount in USD: ");
    scanf("%lf", &amount_usd);
    if (amount_usd < 0) {
        printf("Invalid input\n");
    } else {
        amount_eur = amount_usd * EUR_PER_USD;
        printf("Equivalent amount in Euros: %.2f\n", amount_eur);
    }
    return 0;
}