#include <stdio.h>
#include <math.h>
int main() {
    long long int n, i;
    scanf("%lld", &n);
    for (i = 0; i < n; i++) {
        n = n * 2
    }
    printf("%lld", n);
    return 0;
}

/sandbox/1/a.c:7:14: error: expected ';' after expression
        n=n*2
             ^
             ;
1 error generated.