#include <stdio.h>
int main(void) {
int N;
//scanf("%d", &N);
N = 7;
float x = 0;
float y = 1;
float xy;
int F = 1;
while ( F <= N ){
// Sleep(250);
// Sleep(250);
xy = x + y;
y += xy;
x = xy;
F++;
}
return 0;
}
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